This document provides information about service subdomains (formerly 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. In cPanel & WHM version 76, we renamed proxy subdomains to service subdomains. This name more clearly describes the subdomains’ purpose rather than a specific implementation.
Service subdomain explanation
Service subdomains provide access to
cpsrvd over the standard
https ports. They also provide configuration information for mail clients, as well as calendar and contacts clients. When you create a new account or create a new domain the system automatically creates service subdomains. You can find a list of these subdomains in the Subdomain ports section of this document below.
You can access the cPanel, WHM, and WebMail login interfaces via the associated service subdomain. Alternatively, you can log in via the associated port for a slight speed advantage. The following table compares the advantages of both login types:
Slightly faster server response.
The configuration information service subdomains
autoconfig service subdomains grant programs access to domain configuration settings. Programs access the
service subdomains for calendar and contacts communication. The following tables lists service subdomains, with their associated program:
|Service subdomain||Associated programs|
For more information, read our Thunderbird and Outlook
For more information, read our How to Set Up Calendars and Contacts documentation.
The following table lists the service subdomains with their associated port:
In cPanel & WHM version 62, we expanded Domain TLS to handle Server Name Indication (SNI) functionality for service subdomains. cPanel & WHM enables SNI functionality by default for SSL certificates on service subdomains. For more information about Domain TLS, read our What is Domain TLS documentation.
|Subdomain||Secure port||Non-secure port|
SSL only secures the
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