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For cPanel & WHM version 64

What is an express transfer?

An express transfer moves the specified cPanel account or accounts to a new server, and performs the following actions on the source server:

  • Updates the account's A record to point to the destination server.
  • Changes the domain's nameserver entry to point to the destination server.
  • Updates the MX records to point to the destination server.
  • Adds a redirect for the Account Moved page (cgi-sys/movingpage.cgi) for the following file extensions:

  • Blocks SSH and FTP logins to the source server for the transferred accounts.


The source server handles changes via the /usr/local/cpanel/scripts/xferpoint file.

How do I block an IP address from my server?

You can block IP addresses with WHM's Host Access Control interface (Home >> Security Center >> Host Access Control).

How do I clear a full partition?

Usually, the /var directory fills up first. This is because the /var directory holds all of the system logs.

To clear a full partition in this case, perform the following steps:

  1. To view the directory or log that takes up the most space, run the following commands:

    cd /var
    du -sh 


    The output of these commands shows the used and available space in each directory, as well as the file sizes of each file in the current directory.

  2. Examine the output and determine which directory uses the most space.
  3. Run the cd directory command, where directory is the name of that directory, to change to that directory.
  4. Repeat the first two steps to find the files that use the most space.
  5. Either delete the files, or save the most recent entries. To save the most recent entries, run the following commands:

    tail -5000 filename >
    mv filename
  6. To release the file lock, restart the service that created the file.

The /usr directory also fills up due to Apache. To view the Apache logs, run the following commands:

cd /usr/local/apache
du -sh


The logs/error_log or logs/access_log files are sometimes very large. To resolve this problem, either delete them or use the tail commands in the section above.

How do I restart a daemon?

You can restart most services in WHM's Restart Services interface (Home >> Restart Services).

  • You may need to restart some services in the command line. All standard Linux services (for example, HTTP, FTP, Exim, cPanel & WHM, or MySQL®) have restartsrv_* scripts in the /usr/local/cpanel/scripts/ directory. For more information and a list of available restartsrv_* scripts, read our WHM Scripts documentation.
  • For more information, read our How to Restart Services documentation.


You must log in as the root user to restart a daemon.

How do I fix WHM News?

To fix WHM's News, run the following command:

rm -f /var/cpanel/objcache/whmnews

How can I fix ndc connection refused errors?

To fix ndc connection refused errors, run the following scripts:



Run the /scripts/fixndc script twice.

How do I manually move an account to another server?


In the steps below, the domain is and the username is user.

When an account is too large to move with the web browser, perform the following steps to move the account:

  1. Run the mkdir /home/cptemp command to make a temporary directory in the /home directory where you can store the account's files while you copy them.
  2. Compress and move the public_html directory. To do this, run the following commands:

    cd /home/user/
    tar czvf public_html_user.tgz public_html
    mv public_html_user.tgz /home/cptemp/
    mv public_html /home/cptemp/
  3. Move the site's weblogs. To do this, run the following commands:

    cd /usr/local/apache/userlogs/
    mv /home/cptemp/
  4. After all of the necessary files are in the /home/cptemp/ directory, move the account in WHM. This sets up the new account on the new server.


    For more information, read our How to Copy an Account with SSH Keys documentation.
  5. Navigate to the /home/cptemp/ directory and move the files. To do this, run the following command:

    scp public_html_dom.tgz
  6. Enter the root password for the new server and move the file. To do this, run the following command:

  7. Enter the required login information.
  8. Go to the new server and unpack the two large files that you just moved. To do this, run the following commands:

    cd /home/dom/
    gzip -d
    tar xzvf public_html_dom.tgz
    cd /usr/local/apache/domlogs/

Where is the Pure-FTPd configuration file?

Pure-FTPd configuration information is in the /etc/pure-ftpd.conf file.

How do I enable anonymous uploads with Pure-FTPd?

Use the Allow Anonymous Uploads option in WHM's FTP Server Configuration interface (Home >> Service Configuration >> FTP Server Configuration).

How do I disable the SMART errors?

To disable the SMART errors, run the following commands:

touch /var/cpanel/disablesmartcheck

How do I debug problems with ProFTPd?

To debug ProFTPd problems, perform the following steps:

  1. To shut down ProFTPd, run the following command:

    /usr/local/cpanel/scripts/restartsrv_proftpd --stop
  2. To start ProFTPd, run the following command:

    proftpd -nd9

You may need to use the full path for debug mode. The default path for ProFTPd is /usr/sbin/proftpd

My hard drive is slow and backups take a long time. How can I fix this?

To address this issue, make certain that you have enabled Direct Memory Access (DMA) on your drives.

  • To enable DMA for a hard drive, run the hdparm -d1 /dev/hda command.
  • To disable DMA for a hard drive, run the hdparm -d0 /dev/hda command.
  • To measure transfer rate of a hard drive, run the hdparm -Tt /dev/hda command.
  • To view which options are enabled for a hard drive, run the hdparm /dev/hda command.
  • To see more information on your drive, run the hdparm -i /dev/hda command.


Some older drives and motherboards have a problem with DMA. Ask your data center whether you can enable DMA on your drives.

How do I fix the License File Expired error?


To address this issue, your server must communicate with the license servers.


To confirm that your server's main IP address matches the IP address that cPanel's license servers store, perform the following steps:

  1. Run the following command as the root user:



    If the IP addresses do not match, perform one of the following actions:

    • Configure your server and network to route outbound traffic from the licensed IP address.
    • Change the license IP address to match the IP address that the curl command returned.
  2. Check your license on to confirm that it is valid. If your license is not valid, contact your license provider.
  3. If your license is valid, run the following commands as the root user:

    rdate -s
  4. Confirm that your server queries the root nameservers and has a valid hostname.

If you need assistance, or if these steps did not fix the issue, contact your license provider.

Why do I receive groupadd or useradd errors when I attempt to create a new account?

To ensure that the /etc/passwd and /etc/group files do not include the +i (immutable) flag, run the following commands:

lsattr /etc/group
lsattr /etc/shadow

If these files do not contain the flag, run the following commands:

chattr -i /etc/passwd
chattr -i /etc/group

It is also possible that your group shadow file is corrupt. To fix this issue, perform the following steps:

  1. Move the /etc/gshadow file to the /etc/gshadow.corrupted file.
  2. Run the grpconv command to rebuild the file.
  3. Remove the grshadow.lock and group.lock files, if they are present.


Some services, such as MySQL, do not start on reboots. Why do I get errors about create/write to file (Errcode: 13) in the /tmp file?

This is most likely due to improper permissions in the real /tmp directory. If you use the /scripts/securetmp script at boot time, you may not notice the problem because the script sets permissions correctly after it boots.

The most common error is that the mysqld daemon will not start, with errors that resemble the following example:

 061113 00:14:46 mysqld started 
 /usr/sbin/mysqld: Can't create/write to file '/tmp/ibEkcOgQ' (Errcode: 13) 
 061113 0:14:47 InnoDB: Error: unable to create temporary file; errno: 13 
 061113 0:14:47 [ERROR] Can't init databases 
 061113 0:14:47 [ERROR] Aborting 
 061113 0:14:47 [Note] /usr/sbin/mysqld: Shutdown complete 
 061113 00:14:47 mysqld ended 

To fix this problem, unmount the /var/tmp and /tmp partitions and set the permissions correctly in the real /tmp directory. To do this, perform the following steps:

  1. Run the following commands:

    umount /var/tmp
    umount /tmp
    chmod 1777 /tmp

  2. Edit the /etc/rc.sysinit file and add the following line near the other references to the /tmp directory:

    chmod 1777 /tmp
  3. Reenable the /scripts/securetmp script.


    If you do not wish for your server to run the /scripts/securetmp script, create the /var/cpanel/version/securetmp_disabled file. To do this, run the following command:

    touch /var/cpanel/version/securetmp_disabled

    This file stops the script from running on your server. However, we strongly recommend that you do not disable the /scripts/securetmp script.

If you experience trouble with other services, run the following commands to forcibly enable them:

  • CentOS 7, CloudLinux™ 7, and Red Hat® Enterprise Linux 7 servers — Run the systemctl enable servicename.service command.
  • All other supported operating systems — Run the chkconfig --add servicename command.


  • In these commands, replace servicename with the service's name (for example, pure-ftpd).
  • If, after each reboot, you still receive messages from the chkservd daemon about services that are not down, perform the following steps:
    1. Disable the service with the chkconfig command.
    2. Add the service to the end of the /etc/rc.local file to ensure that other services have time to start up first.

How do I change nameservers?

You can change nameservers in WHM's Basic WebHost Manager Setup interface (Home >> Server Configuration >> Basic WebHost Manager Setup).

To change your domain's nameservers, contact your web host and your domain registrar to update the information.

Why do I see this error message: [a fatal error or timeout occurred while processing this directive]?

Check the /usr/local/cpanel/logs/error_log file for the specific error. You may need to submit a ticket to our support department resolve this issue.

How do I make sure that my server runs the latest version of cPanel & WHM?

When you log in, the cPanel & WHM version displays in the upper right-hand corner of the interface. You can also determine the version with the /usr/local/cpanel/cpanel -V command.

To see the latest available cPanel & WHM version in your chosen release tier, visit .

To update cPanel & WHM, use WHM's Upgrade to Latest Version interface (Home >> cPanel >> Upgrade to Latest Version). To update cPanel & WHM from the command line as the root user, run the /scripts/upcp --force command.

To configure your server to automatically update to the latest version every morning, navigate to WHM's Update Preferences interface (Home >> Server Configuration >> Update Preferences) and select Automatic in the Daily Updates section.

Can you easily change the A records to point to an IIS server through cPanel & WHM?

There are two ways to change the A records in the WHM interface:

  • To edit the DNS zone manually and change the A records for the domain, use WHM's Edit DNS Zone interface (Home >> DNS Functions >> Edit DNS Zone) to edit the desired zone.
  • To cause your server to use A records that point to another server whenever you create DNS zones, use WHM's Edit Zone Templates interface (Home >> DNS Functions >> Edit Zone Template) to modify the DNS zone template.

Why do I receive the message "unable to add the user" when I create an account?

The user may already exist on your system. If this is the case, use your operating system's user deletion tool to delete that user.

To check whether the user already exists, log in to your server and perform the following actions:

  • Check the /home/username directory for a home directory for that user.
  • Check the contents of the /etc/passwd directory for an entry for that user.

How do I preview a new domain before the DNS switch makes it live?

To preview the domain, enter the server's IP address and your cPanel username in a web browser. For example, if your IP address is and your username is bob , you can use:


You web host may disable this function for security reasons.

How do I disable or enable WHM access from the command line?

To disable WHM access for all users, block incoming traffic on port 2086 and 2087.


This will lock you out as well.

You can also use a firewall to allow access to those ports for specific IP addresses only.

You cannot turn an account into a reseller account (grant WHM access) from the command line. However, you can use WHM API 1 to automate this process.

You cannot shut down WHM, because WHM services ensure that the server functions.

How do I delete the mail statistics logs on a daily basis?

The MySQL database in the /var/lib/mysql/eximstats file stores mail statistics. Remove the entries from this database.

Alternatively, you must clear the mail logs in the /var/log, exim_mainlog, exim_rejectlog, and exim_paniclog files daily.

A cronjob can easily execute a script that clears these files.

Is it possible to create domain templates?

Yes, cPanel & WHM calls these packages. Create these configurations in WHM's Add a Package interface (Home >> Packages >> Add a Package) and then apply them to new accounts.

I am a web hosting provider. Can I create a custom login page for my customers to log in to cPanel, WHM or Webmail?

Yes. To view sample source code that you can use to integrate customized login to a website, access the PHP website.

How do I change the version of PHP that I have installed on my server?

To change the version of PHP that you have installed on your server, perform the following steps:

  1. Log in to WHM.
  2. Access the EasyApache 3 interface (Home >> Software >> EasyApache 3).
  3. Recompile Apache and select the version of PHP that you wish to install on your server.

Does cPanel & WHM include anti-virus protection?

Yes, it includes ClamAV. To configure this feature, use WHM's Configure ClamAV Scanner interface (Home >> Plugins >> Configure ClamAV Scanner).

Does cPanel & WHM support multiple levels of permissions?

Yes. cPanel & WHM supports root users that can create and modify any domain and have access to all features of the cPanel & WHM interfaces.

We also support reseller accounts, which web hosting resellers can use to manage their own customer's accounts. However, you can easily tweak reseller access so that they only have privileges to suspend or unsuspend domains. Resellers have access to the cPanel interface and a limited subset of the functionality of the WHM interface.

Hosting account owners have an account in the cPanel interface and can manage most aspects of a website by themselves (within the boundaries that the reseller or root user sets).

When I create a domain, are web statistics automatically generated?

Yes. You can set an interval at which statistics update in WHM's Statistics Software Configuration interface (Home >> Server Configuration >> Statistics Software Configuration).


Statistics are not available on the newly-created domain until after this interval.

cPanel & WHM includes the following web statistics software:

How can I cause the homepage of a folder to automatically default to index.php?

There are a few lines in the /usr/local/apache/conf/httpd.conf file that allow for a index.php file to display automatically. This will resemble the following example:

# DirectoryIndex: Name of the file or files to use as a pre-written HTML # directory 
index.  Separate multiple entries with spaces.
# <IfModule mod_dir.c>    DirectoryIndex index.ppl index.plx index.perl index.html index.wml index.cgi 
index.shtml index.jsp index.js index.php4 index.php3 
index.php index.phtml index.htm default.htm default.html 
home.htm </IfModule>

If those lines are not present, you will need to add the following line to a .htaccess file:

DirectoryIndex index.php

For more information about .htaccess files, visit the Apache website.

Can I disable non-SSL login for cPanel & WHM?

Set the Choose the closest matched domain for which that the system has a valid certificate when redirecting from non-SSL to SSL URLs. Formerly known as “Always redirect to SSL/TLS” option to On in WHM's Tweak Settings interface (Home >> Server Configuration >> Tweak Settings). This will disable the use of the insecure ports and redirect users to secure ports with the /cpanel alias, the /whm alias, and the /webmail alias.

What PHP modules and plugins does cPanel & WHM support?

You can find a list of supported modules and plugins in our EasyApache documentation.

How do I delete an account?

You can delete an account with WHM's Terminate Accounts interface (Home >> Multi Account Functions >> Terminate Accounts).


You cannot reverse this process. Back up the account before you delete it.

What is the WHM Autofixer?

The Autofixer script collection allows you to fix some common issues from a web browser that you cannot otherwise access from the command line.

You can find the following Autofixer scripts in cPanel's httpupdate autofixer repository:

  • test — This script is a test autofixer on your system and does not apply any changes.
  • bsdbindfix — This script resolves port issues with BIND 9.
  • compresszlibfix — This script fixes a compress zlib error.
  • dbdmysql — This script fixes DBD::mysql issues for older versions of Red Hat Enterprise Linux®.
  • fpindexfile — This script fixes the Microsoft® FrontPage® index.
  • iptablesflush — This script flushes iptables rules from WHM if your firewall prevents SSH access.
  • libxml64fix — This script fixes libXML on 64-bit systems.

  • remove_prelink — This script removes prelink from your server.
  • resellerresourceacctounts — This script fixes reseller resource accounts.
  • safesshrestart — This script restores the SSH configuration file and restarts SSH if you are locked out.
  • vfilterfix — This script restores /etc/vfilters files.
  • yumduprpmfix — This script attempts to locate and resolve any duplicate RPMs.

To run an Autofixer script, perform the following steps:

  1. Navigate to the following URL, where serverip represents your server's IP address:

  2. Log in to WHM with the root user's password.
  3. Enter the Autofixer script name that you wish to run and click Submit.

The Autofixer script will display its results in your browser. 

Why will my server not resolve domains?

This is usually due to an invalid nameserver setting in the /etc/resolv.conf file.

  • Contact your data center for suggested nameservers within their network.
  • You can also add a valid public nameserver to the /etc/resolv.conf file.

How do I use WHM on a PDA?

Point your PDA's web browser to https://server:2087/scripts/command?PFILE=main , where server is the IP address or hostname of your server, or a domain that the server hosts.

I installed Tomcat. How do I install servlets on an account?


EasyApache 3 does not support Tomcat for new installations. EasyApache 4 does not support Tomcat and we do not plan to provide support in the future. 

Navigate to WHM's Install Servlets interface (Home >> Account Functions >> Install Servlets). Select an account or domain on which you wish to install servlets, and apply the settings.


If you have not installed Tomcat, you cannot view the Install Servlets interface.

What if cPanel & WHM will not update?

If cPanel & WHM will not update, submit a ticket to our support department.

Whenever I set up a domain, I receive an ndc can't connect, connection refused message. What is this?

ndc is the name daemon control program. If you receive that error, run the following script as the root user:


If the problem persists, submit a ticket to have support look at the named configuration.

Will cPanel & WHM continue to support FrontPage® extensions? What about on Apache 2?

Because Microsoft® discontinued support for mod_frontpage extensions on Linux servers in 2006, we have also marked the FrontPage service in cPanel & WHM as End Of Life. FrontPage was removed from EasyApache in late 2013. We strongly recommend that you use another method to publish content, such WebDAV or FTP. FrontPage extensions are still available as a Custom Module (“Opt Mods”) for EasyApache; however, we strongly discourage its use and the Custom Module is only compatible with Apache version 2.2.

Apache 1.3, 2, and 2.2 currently support FrontPage extensions.

How can I copy files from one domain directory to another?

You need root user privileges to copy the files with the cp command.

For example, to copy one directory to another location, run the following command:

cp -R /home/dave/public_html/photos/ /home/john/public_html/images/

For more information on the cp command, run the man cp command on the command line.

You can also download the files that you wish to copy in cPanel's File Manager interface (Home >> Files >> File Manager). Then, log in to the other domain's account and upload the files to that account.

My X server GUI does not work after I install cPanel

Due to numerous security problems, cPanel uninstalls X so that it will not run. You should never run X on a public server.

How can I fix quotas that do not work?

Check for quota support on the mounted filesystems:


-rwxr--r-- 1 root root 8192 Dec 26 20:18 aquota.user*
-rwxr--r-- 1 root root 2097120 Apr 30 04:19 quota.user*
  • If these files do not exist, run the /scripts/initquotas script.
  • If they do exist, but quotas do not work, delete the quota files and run the initquotas script or the /scripts/fixquotas script.
    • After this, repquota -a should print out the soft and hard limits with grace periods for all users.
  • If quotas still do not report anything in WHM or cPanel, set the Cache disk quota information option to Off in WHM's Tweak Settings interface (Home >> Server Configuration >> Tweak Settings).

How can I find out where all of a user's files are?

If there is a discrepancy between quotas and the results of the du -sh /home/username command, that user's UID may still own some other files on the system.

To find the location of all of a user's files, perform the following steps:

  1. Run the find / -user username -ls command.
    • The output is a long list of all of the files that the user owns..
  2. Redirect the output to a file to browse through later.
    • You can change the files' ownership to the root user rather than delete them with the chown command.

Is cPanel & WHM compatible with mod_security?

You can install the mod_security module through the EasyApache 3 interface (Home >> Software >> EasyApache 3). For more information about how to configure the mod_security module, visit the ModSecurity website.

How can I obtain information about how to develop software that integrates with WHM?

Use our plugins system with the WHM API to perform any of the following actions.

  • Create a piece of software that interacts with WHM.

  • Add an icon for your software inside of cPanel & WHM.
  • Get information from cPanel & WHM

You can also create cPAddon scripts, which allow customers to download your software to their servers. Domain owners can install the new software with cPanel's Site Software interface (Home >> Software >> Site Software). For more information, read our cPAddons documentation.

For more information about how to interact with cPanel & WHM as a developer, read our Developer Resources.

How can I put the Change Language icon in cPanel's Preferences section?

Select the Change Language option for that account in the Feature Manager interface (Home >> Packages >> Feature Manager).

How do I set up personal nameservers in WHM?


You will need an IP address for each nameserver.

To set up a personal nameserver, perform the following steps:

  1. Navigate to the Nameservers section of the Basic WebHost Manager Setup interface (Home >> Server Configuration >> Basic WebHost Manager Setup)
  2. Add your nameservers in the available text boxes.
  3. Click Assign IP Address next to each nameserver to assign it an IP address.
  4. Click Add an A entry for this nameserver to allow each nameserver to resolve through DNS.
  5. Click Nameserver Selection under Service Configuration to enable the nameservers.

How do I stop the "There is a problem with this website's security certificate" message when a user logs in to cPanel?

In the Manage Service SSL Certificates interface (Home >> Service Configuration >> Manage Service SSL Certificates), you can change the certificates for cPanel & WHM, webmail, your mail servers, etc. You must replace the self-signed certificate with one trusted by the common browsers.

To do this, purchase an SSL certificate through WHM for your hostname in the Purchase and Install SSL Certificate interface (Home >> SSL/TLS >> Purchase and Install SSL Certificate).

How do I call the WHM API?

For information about the WHM API, read our WHM API documentation.

Why does Munin fail to update?

Munin is a cPanel plugin that displays information about CPU, Exim, Apache, MySQL usage, and other information with rrdtool. If it fails to update, there is likely a permissions issue.

To troubleshoot this problem, perform the following steps:

  1. Check to make sure that the nightly cron maintenance runs, and that there is a crontab entry for Munin.
  2. Check the /var/lib/munin and /var/log/munin files. munin:munin must own the files in both directories.


    If munin:munin does not own the files in the /var/log/munin directory, the log files will update, but the graphs that Munin displays will not update.

  3. To correct the permissions issue, run the following commands as the root user:

    chown -R munin:munin /var/log/munin
    chown -R munin:munin /var/lib/munin
  4. To run Munin manually from the command line, run the following command:

    sudo -u munin munin-cron
  5. You should see new entries in the /var/log/munin/munin-update file and no errors in the log file. The graphs will update when you refresh the Munin display in WHM.


The weekly graphs may not update immediately. These will update at the appointed time that you configure in the crontab.

Does cPanel & WHM support Resin? Does cPanel & WHM support other Java Application Servers?

cPanel currently supports Tomcat as a Java Application Server. To request other servers, submit a feature request.

How can I create a demo version of cPanel & WHM?

To create a demo version of cPanel & WHM, perform the following steps:

  1. Create a new account in WHM. You can use a nonexistant domain name.
  2. Use cPanel & WHM's branding features to modify the account with your company's logo and look.
  3. Access WHM's Manage Demo Mode interface (Home >> Account Functions >> Manage Demo Mode).
  4. Select the account that you wish to turn to demo mode.
  5. Click Modify.
  6. Click Enable.

My Ruby on Rails installation does not work


 Ruby on Rails does not function on Amazon Linux servers and is not currently available on CentOS 7 servers.

cPanel & WHM uses the standard set of tools that Ruby on Rails® provides. You can use them to troubleshoot your installation.

  • The error_log file often shows what is wrong with the Rails installation.
  • If it is an application-specific issue, mongrel maintains its own error log file in the {appbase}/log/mongrel.log file.
    • If an application starts and fails without anything in the error_log file, the {appbase}/log/mongrel.log will probably also have an indication of the problem.
  • You may need to install some gems. You can check which gems are installed via a gem query:
    • mongrel
    • rails
    • rake


      • If any of these gems are not present, you can install them via the gem install <name> command.
      • If the wrong version is installed, run the gem uninstall command.

If you verify all of this information and the application still does not start correctly, start the mongrel server manually with the following command:

 mongrel_rails start -p -d -e production -P log/ 


  • Run this command from the Rails application's base directory as the user who owns the Rails application.
  • The port can be found in the ~/.cpanel/ruby-on-rails.db file .
  • If you are still unable to fix your Rails installation, open a ticket with either your data center or with cPanel.

I just created a new account. Why does it show that disk space is already used?

This problem could be due to one of the following reasons.


For more information, read our Quotas documentation.

When you terminate a user's account from the system, their UID may still own files.

When you create new account, the system assigns it the next availble UID, which is usually the UID of a terminated account. The new account assumes ownership of all files that the old user owns, and gives the appearance that the user is already over quota though, even though nothing has been uploaded.

Tarballs (.tgz, .tar, .tar.gz) may have files that the user who tarred them owns.

When you extract files on your server, the system assigns the files ownership of whatever account has that UID.

How can I set up a default page that the server generates I create a new domain?

Set up a default site in the /root/cpanel3-skel/public_html/ directory. This is the default website for all accounts that you add afterwards.

How can I configure yum to work with cPanel & WHM?

cPanel & WHM requires that you modify certain packages because cPanel & WHM handles its own installations of services that are separate from what the distributors provide. If you modified the yum.conf file, confirm that the following excludes exist:

apache bind-chroot dovecot exim httpd mod_ssl mysql nsd perl php proftpd pure-ftpd spamassassin squirrelmail


We also strongly recommend that you use only the vendor-provided distributions, because we only test cPanel & WHM with these packages. Third-party repositories like RPMForge can replace vital parts of the system on which cPanel & WHM relies, and can cause unexpected results.

Is there a way to access Webmail, cPanel, and WHM from behind a firewall?

WHM includes a feature that allows your customers access the following accounts from behind a firewall with port 80:

  • — The customer's cPanel account.
  • — The customer's WHM account.
  • — The customer's Web Disk account.
  • — The customer's Webmail account.


In these examples, stands for the customer's domain.

To enable this feature, select On for the following settings in WHM's Tweak Settings interface (Home >> Server Confirguration >> Tweak Settings):

  • Proxy subdomains
  • Proxy subdomain creation

You can also use the /scripts/proxydomains to reconfigure the DNS entries manually.

Can I run cPanel & WHM behind NAT?

Yes. For information on how to run cPanel & WHM in a 1:1 NAT configuration, read our 1:1 NAT documentation.

Where do I go to find out when cPanel & WHM releases a new build?

We release some builds quicker than others. For example, we release CURRENT builds more quickly than RELEASE builds, and we release EDGE builds more quickly than CURRENT Builds.

To find the latest builds, go to, and look for your operating system.

I use the APF firewall rules on my server; which ports should I allow?

Allow the following ports:

<pre># Common ingress (inbound) TCP ports
IG_TCP_CPORTS=&quot; 20,21,22,25,26,53,80,110,143,443,465,993,995,2077,2078,2082,
# Common ingress (inbound) UDP ports

# Common ICMP (inbound) types
# &apos;internals/icmp.types&apos; for type definition; &apos;all&apos; is wildcard for any
# Common egress (outbound) TCP ports
# Common egress (outbound) UDP ports
# Common ICMP (outbound) types
# &apos;internals/icmp.types&apos; for type definition; &apos;all&apos; is wildcard for any

What does the rndc: connection to remote host closed message indicate?

You may see the following message:

Attempting to restart bind 
Waiting for bind to restart.... . . . . . . . . . . finished. 

rndc: connection to remote host closed 

This message may indicate that the following are true:

  • The remote server uses an older version of the command protocol.
  • This host is not authorized to connect.
  • The key is invalid.

To fix this issue, run the /scripts/fixndc script.

Which browsers are compatible with cPanel & WHM?

cPanel & WHM is compatible with the following browsers:

  • Google Chrome 34 and above. Get the latest version.
  • Mozilla Firefox 29 and above. Get the latest version.
  • Microsoft Internet Explorer 9 and 10. Get the latest version.


    You can use older versions of these browsers. However, we do not support older versions of the listed browsers. We strongly encourage you to upgrade to the latest version of your preferred browser.

Why do I receive emails with the subject “Output from your job” from my server?

cPanel & WHM installs the at daemon (atd) as part of the update process. We use it to launch the update analysis process to validate the health of the system after updates.

If the update analysis process encounters any errors, the at daemon emails a report to the system administrator account.

I cannot compress or extract .zip files in File Manager

If you cannot compress or extract .zip files in cPanel's File Manager interface (Home >> Files >> File manager), then Zip is not installed on your system. Your system administrator must install Zip at the command line with the yum install zip command.

How do I change the maximum connections for HTTP?

You can change the value of the Max Clients setting in WHM's Global Configuration interface (Home >> Service Configuration >> Apache Configuration >> Global Configuration).


The value you choose for the Max Clients setting must be equal to or lower than the value of the Server Limit setting.

How do I change the maximum number of IMAP connections per IP address?

You can change the value of the Maximum IMAP Connections Per IP setting in WHM's Mailserver Configuration interface (Home >> Service Configuration >> Mailserver Configuration).

How do I change the maximum number of POP3 connections per IP address?

You can change the value of the Maximum POP3 Connections Per IP setting in WHM's Mailserver Configuration interface (Home >> Service Configuration >> Mailserver Configuration).

How do I change the maximum number of simultaneous incoming SMTP calls?

You can change the value of the smtp_accept_max setting in WHM's Exim Configuration Manager interface (Home >> Service Configuration >> Exim Configuration Manager).

Additional documentation