Child pages
  • How to Configure Your Firewall for cPanel Services
Skip to end of metadata
Go to start of metadata

Overview

cPanel & WHM installs and manages many different services on your system. Most of these services require an external connection in order to function properly. Because of this, your firewall must allow cPanel & WHM to open the ports on which these services run. This document lists the ports that cPanel & WHM uses, and which services use each of these ports, to allow you to better configure your firewall.

Warning:

  • We strongly recommend that you only open ports for services that you use.
  • So that you do not lock yourself out of your server, make certain to include a way to log back in to your server when you work with firewall rules. Always maintain console access to your server.

Ports

Important:

We strongly recommend that you use the SSL version of each service whenever possible.

  • The use of non-SSL services could allow attackers to intercept sensitive information (for example, login credentials). 
  • Ensure that valid SSL certificates exist for your services in WHM's Manage Service SSL Certificates interface (Home >> Service Configuration >> Manage Service SSL Certificates).
  • For more information on how to access cPanel & WHM services, read our How to Access cPanel & WHM Services documentation.
PortServiceTCPUDPInboundOutboundNotes
20FTP
 

We recommend that you use SFTP via SSH, because it is more secure than FTP.

21FTP
 
22SSH
 
  
25SMTP
 
 
26SMTP
 
cPanel & WHM only uses this port if you specify it in WHM's Service Manager interface (Home >> Service Configuration >> Service Manager).
37rdate
  
 
43whois
  
 
53bind
cPanel & WHM only uses this port if you run a public DNS server.
80http
 
 
110POP3
 
  
113ident
  
 
143IMAP
 
  
443https
 
WHM's Manage AutoSSL feature (Home >> SSL/TLS >> Manage AutoSSL) requires outbound access to the store.cpanel.net server.
465SMTP, SSL/TLS

 
579cPHulk

   This port should only accept connections on the 127.0.0.x IPv4 address. This port does not need to accept external traffic.
783Apache SpamAssassin™
  
873rsync
 
 
993IMAP SSL
 
  
995POP3 SSL
 
  
2703Razor   
Razor is a collaborative spam-tracking database. For more information, visit the Razor website.
2077WebDAV
 
cPanel's Web Disk interface (Home >> Files >> Web Disk) uses this port.
2078WebDAV SSL
 
cPanel's Web Disk interface (Home >> Files >> Web Disk) uses this port.
2079CalDAV and CardDAV
 
cPanel's Calendars and Contacts interface (Home >> Email >> Calendars and Contacts) uses this port.
2080CalDAV and CardDAV (SSL)
 
cPanel's Calendars and Contacts interface (Home >> Email >> Calendars and Contacts) uses this port.
2082cPanel
 
  
2083cPanel SSL
 
  
2086WHM
 
  
2087WHM SSL
 
  
2089cPanel Licensing
  

Warning:

You must open this port in order to contact the cPanel license servers. 

2095Webmail
 
  
2096Webmail SSL
 

  
2195APNs

 

 

cPanel & WHM only uses this port for Apple Push Notification Service (APNs). For more information, read our How to Set Up iOS Push Notifications documentation.
3306MySQL®
 
 MySQL uses this port for remote database connections.
6277DCC
For more information, read Apache's DCC and NetTestFirewallIssues documentation.
24441Pyzor
For more information, read Apache's Pyzor and NetTestFirewallIssues documentation.

Example configurations

The following examples illustrate how to add rules with CSF, APF, and the iptables application.

Important:

  • We do not recommend that you use these examples. Instead, make certain that your firewall rules match the way in which you use cPanel & WHM's services.
  • CentOS 7, CloudLinux™ 7, and Red Hat® Enterprise Linux (RHEL) 7 servers have additional requirements. For more information, read the CentOS 7, CloudLinux 7, and RHEL 7 firewall management section below.

CSF

ConfigServer provides the free WHM plugin CSF, which allows you to modify your iptables rules within WHM. It is a stateful packet inspection (SPI) firewall, login, and intrusion detection mechanism, and general security application for Linux servers.

To install CSF, run the following commands as the root user:

wget https://download.configserver.com/csf.tgz
tar -xzf csf.tgz 
cd csf & ./install.cpanel.sh

To configure CSF, use WHM's ConfigServer & Firewall interface (Home >> Plugins >> ConfigServer & Firewall).

For more information about how to install and use CSF, visit the CSF website.

APF

APF acts as a frontend for the iptables application, and allows you to open or close ports without the use of the iptables syntax. For more information, read the APF site

The following example includes two rules to add to the /etc/apf/conf.apf file to allow HTTP and HTTPS access to your system:

# Common ingress (inbound) TCP ports
IG_TCP_CPORTS="80,443″# Common egress (outbound) TCP ports
EG_TCP_CPORTS="80″

iptables

While CSF and APF are easy to use, the iptables application offers more customization options for your packet filtering rules. The iptables application requires that you understand the TCP/IP stack. For more information, visit the iptables site or run the man iptables command from the command line.

The following example includes iptables rules for HTTP traffic on port 80:

Note:

This example assumes that you have a DMZ set up on eth0 for 192.168.1.1 and a broadcast IP address of 66.66.66.66.

$IPTABLES -A FORWARD -p TCP -i 66.66.66.66 -o eth0 -d 192.168.1.1 -dport 80 -j allowed
$IPTABLES -A FORWARD -p ICMP -i 66.66.66.66 -o eth0 -d 192.168.1.1 -j icmp_packets

CentOS 7, CloudLinux 7, and RHEL 7 firewall management

Servers that run the CentOS 7, CloudLinux 7, and RHEL 7 operating systems require that you use the firewalld daemon.

  • While you can use the iptables command for temporary firewall rules, we recommend that you only use the firewall utilities on CentOS 7, CloudLinux 7, and RHEL 7 servers.
  • For more information about the firewall utilities and the firewalld daemon, read Red Hat's Using Firewalls documentation.

cPanel & WHM version 11.50 and later also includes the cpanel service, which manages all of the rules in the /etc/firewalld/services/cpanel.xml file. This allows TCP access for the server's ports.

To add these rules automatically, perform the following steps:

  1. Run the yum install firewalld command to ensure that your system has firewalld installed.
  2. Run the systemctl start firewalld.service command to start the firewalld service.
  3. Run the /scripts/configure_firewall_for_cpanel script.

Additional documentation