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Overview

This document provides an overview of proxy subdomains. In cPanel & WHM version 11.42 and later, we modified Apache's configuration to properly use proxy subdomains with Secure Sockets Layer (SSL) protocol.

Proxy subdomain explanation

Proxy subdomains provide access to cpsrvd over the standard http and https ports. They also provide configuration information for mail, calendar, and contact clients. When you create a new account, parked domain, or addon domain, the system automatically creates these proxy subdomains.

Note:

To use this feature, your system administrator must enable the Proxy Subdomain Creation setting in the Domains section of WHM's Tweak Settings interface (Home >> Server Configuration >> Tweak Settings).


We recommend that you access the cPanel, WHM, and WebMail login interfaces via the associated port for the speed advantage. However, certain circumstances require that you use a proxy subdomain instead. The following table compares the advantages of both login types:

Login TypeAdvantage

Port

For example: https://example.com:2083

Faster communication

Proxy subodmain

For example: https://cpanel.example.com

  • Can access from a network with restrictive firewall (for example, the firewall restricts access to ports 80 and 443)
  • Easier to remember than a port number

The configuration information proxy subdomains

The autodiscover and autoconfig proxy subdomains grant programs access to domain configuration settings. Programs access the cpcalendarsand cpcontacts proxy subdomains for calendar and contact communication. The following tables lists proxy subdomains, with their associated program:

Proxy subdomainAssociated programs 
autodiscoverMicrosoft Outlook® 

For more information, read our Thunderbird and Outlook autodiscover and autoconfig support documentation.

autoconfigThunderbird
cpcalendarsCalDav and calendar clients

For more information, read our How to Set Up Calendars and Contacts documentation.

cpcontactsCardDav and contact clients

Subdomain ports

The following table lists the proxy subdomains with their associated port:

SubdomainSecure portNon-secure port
cpanel20832082
whm

2087

Note:

SSL only secures the whm proxy subdomain for resellers.

2086

 

webmail20962095
webdisk20782077
autodiscover44380
autoconfig44380

cpcalendars

2080

2079

cpcontacts

2080

2079

Additional documentation

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