This documentation is for cPanel & WHM version 64 builds. The "STABLE" version of our documentation can be found in the Documentation space.
(Home >> SSL/TLS >> Manage AutoSSL)
This interface allows you to manage the AutoSSL feature, which automatically installs domain-validated SSL certificates for the Apache and Dovecot services on users' domains. It also allows you to review the feature's log files and select which users to secure with AutoSSL.
Let's Encrypt™ imposes significant rate limits. For more information read our Let's Encrypt rate limits section.
- The AutoSSL feature requires outbound access to the
store.cpanel.netserver over port 443. For more information, read our How to Configure Your Firewall for cPanel Services documentation.
- While the AutoSSL feature generally only requires a short amount of time to complete the installation process, certain factors may lead to longer wait times. Under some conditions, certificates may require up to 48 hours to process.
Domain and rate limits
The AutoSSL feature includes the following limitations and conditions:
Each AutoSSL provider may use a specific domain rate limit. For example:
Certificates that cPanel, Inc. provides through AutoSSL can secure a maximum of 200 domains per certificate (Apache virtual host).
Certificates that Let's Encrypt provides can secure a maximum of 100 domains per certificate.
AutoSSL only includes domains and subdomains that pass a Domain Control Validation (DCV) test, which proves ownership of the domain.
- AutoSSL includes corresponding
www.domains for each domain and subdomain in the certificate, and those
www.domains count towards any domain or rate limits.
For example, for the
example.comdomain, AutoSSL automatically includes
www.example.comin the certificate.
- If the corresponding
www.domain does not pass a DCV test, AutoSSL will not attempt to secure that
This affects Let's Encrypt's limit of 20 certificates per week that may contain a domain or its subdomains.
- AutoSSL does not secure wildcard domains.
- Each AutoSSL provider may wait for a specific amount of time to replace an AutoSSL-provided certificate before it expires. For example:
- AutoSSL attempts to renew certificates that cPanel, Inc. provides when they expire within 15 days.
- AutoSSL attempts to renew certificates that Let's Encrypt provides when they expire within 29 days.
- Due to rate limits, AutoSSL prioritizes new certificates over the renewal of existing certificates.
- AutoSSL will not attempt to replace pre-existing certificates that it did not issue (for more information, read the Options section below).
- AutoSSL replaces certificates with overly-weak security settings (for example, an RSA modulus of 512-bit or less).
If a virtual host contains more than the provider's limit of domain names, AutoSSL uses a sort algorithm to determine the priority of domains to secure. For more information, read the Which domains does AutoSSL add to the certificate first section below.
For example, the following table demonstrates these limitations for the cPanel AutoSSL provider:
|Virtual Host 1||Virtual Host 2||Result|
AutoSSL generates one certificate for the account, which secures all 200 domains.
|202 domains||AutoSSL generates one certificate for the account, which secures the the 200 first domains from the sort algorithm.|
|100 domains||100 domains||AutoSSL generates a certificate for each virtual host that secures all of the domains on that virtual host.|
|100 domains||102 domains||AutoSSL generates a certificate for each virtual host that secures all of the domains on that virtual host.|
|100 domains||202 domains|
AutoSSL generates two certificates:
Select an AutoSSL provider
To select an AutoSSL provider, perform the following steps:
Select the desired AutoSSL provider or select disabled to disable this feature.
- If the AutoSSL provider requires that you accept their Terms of Service or other similar agreement, read the document and select the appropriate checkbox to agree to those terms.
- To reset your registration with the AutoSSL provider due to security issues, select the appropriate checkbox to agree to those terms. Then click Reset Registration.
- Click Submit.
If the provider updates their Terms of Service, you may need to return to this interface to agree to them.
Users must use a package that includes the
autossl feature in order to receive the free certificates. For more information about feature lists, read our Feature Manager documentation.
Feature list override
To override your sever's feature list settings and control whether AutoSSL is enabled for a user or users, perform the following steps:
- Click the Manage Users tab to display a table of users on the server.
- You can search and navigate the list of users with the navigation controls.
- To set the feature on all domains, click Enable AutoSSL on all users , Disable AutoSSL on all users, or Use Feature List for all users.
- To set the feature on multiple domains, select the appropriate checkboxes and click Enable AutoSSL on selected users , Disable AutoSSL on selected users, or Reset AutoSSL for selected users.
- To enable or disable AutoSSL on a single domain, select the appropriate option:
- Enable AutoSSL — Override the user's Feature List settings to enable AutoSSL.
- Disable AutoSSL — Override the user's Feature List settings to disable AutoSSL.
- Reset to Feature List Setting — Allow the user's feature list settings to determine whether AutoSSL is enabled or disabled.
- Because the system adds the
/etc/cron.d/cpanel_autosslcron job to schedule automatic certificate provisioning, you may experience a delay before the system installs Let's Encrypt certificates. The interface displays the next time that the script will run.
- The system restarts Apache after AutoSSL provisions and installs certificates for all accounts each night.
By default, AutoSSL does not attempt to replace preexisting certificates that it did not issue. This behavior ensures that AutoSSL-provided certificates do not unexpectedly replace Extended Validation (EV) and Organizational Validation (OV) certificates from a certificate authority (CA) with AutoSSL-provided certificates.
However, if you wish to allow AutoSSL to replace certificates that it did not issue, select the Allow AutoSSL to replace invalid or expiring non-AutoSSL certificates. option. AutoSSL will not attempt to replace preexisting valid certificates that expire in more than three days.
Click Run AutoSSL for All Users at the top of the interface to run the AutoSSL feature for all users for whom you enabled the feature.
To run the AutoSSL feature for a single user, select the checkbox next to that user, then click Enable AutoSSL on the selected 1 user.
The system automatically polls the certificate provider to determine each pending certificate's status.
|Age of certificate request||Polling frequency|
|Less than one day.||Once per five minutes.|
|Between one and two days.||Once per hour.|
|More than two days.||Once per day.|
The cPanel (powered by Comodo) provider does not accept additional AutoSSL requests for a virtual host if an AutoSSL request already exists for that virtual host.
Review log files
To review AutoSSL log files, perform the following steps:
- Click the Logs tab.
- Select the log that you wish to view from the menu, and click View Selected Log.
- Click Refresh Logs List to refresh the list of log files.
The system stores the log files in both text and JSON format in the
The Pending Queue section of the interface lists the details and the status of the pending AutoSSL jobs on your server.
Use the navigation controls at the top of the table to sort and search through the list.
Frequently Asked Questions
How do I revoke a certificate?
We do not support the revocation of certificates through cPanel & WHM at this time.
Why won't Let's Encrypt issue a certificate for a virtual host list (website)?
Let's Encrypt only issues a certificate five times per week to a specific set of domains before it blocks any further certificates for that set of domains.
To work around this rate limitation, create an alias to a domain in the virtual host list (website) so that Let's Encrypt interprets the virtual host as a new set of domains.
Which domains does AutoSSL add to the certificate first?
AutoSSL uses a sort algorithm to establish which domains to add to the certificate first. This sort order ensures that the system adds the domains that customers will most likely visit to the certificate first. For example, customers most likely intend to navigate to
This function assumes that all of the fully qualified domain names (FQDNs) resolve to the same virtual host.
This sort order ensures that the system adds the domains that users will most likely visit to the certificate first. The default sort algorithm prioritizes domains in the following order:
- Any FQDNs that the virtual host’s current SSL certificate secures
- The primary domain on the cPanel account and then its
- Each addon domain followed by its
mail.subdomains. For example: A cPanel user called
example(whose primary domain is
example.com), creates an addon domain called
foo.com. This addon domain, like all cPanel addon domains, exists on a separate virtual host with a subdomain
foo.example.com. In this case, the system prioritizes
- Domains with fewer dots. For example, prioritize
- Shorter domains
- Apply lexicographical sort
Does AutoSSL cover proxy subdomains?
In cPanel & WHM version 64 and later, AutoSSL adds proxy subdomains to the SSL certificate in accordance with the sort algorithm. For more information about proxy subdomains, read our Proxy Subdomains Explanation documentation.
AutoSSL only adds the
whm proxy subdomain to the SSL certificate for reseller accounts.
When does an AutoSSL cPanel-issued certificates expire?
A cPanel-issued AutoSSL certificate expires after 90 days. However, AutoSSL attempts to automatically replace that certificate before it expires.
What rate limits does Let's Encrypt impose?
cPanel & WHM ships with the cPanel (powered by Comodo) provider. To install the Let's Encrypt AutoSSL provider plugin, read our The Let's Encrypt Plugin documentation.
- Certificates that Let's Encrypt provides through AutoSSL can secure a maximum of 100 subdomains per domain (Apache virtual host).
- Let's Encrypt issues one certificate per domain, and issues a maximum of 20 certificates per week. Each certificate can secure up to 100 subdomains of the domain on the certificate.
- Let's Encrypt continues to issue up to 20 certificates per week, if you request more than 20 domain certificates.
- Let's Encrypt uses the domain's alias (parked domain), not the main domain, as the common name for AutoSSL. To use the main domain as the common name for AutoSSL, you must use cPanel or another AutoSSL provider. For more information, consult the Let's Encrypt Community Support page.