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Firewall and Port Issues

To achieve full access to all services provided by their hosting accounts, clients require an open or appropriately configured internet connection providing access to and from the ports handling the concerned services.

Occasionally, hosting clients accessing their server from behind a corporate or personal firewall can be thwarted by overly restrictive or badly planned firewall rules. This is particularly likely in cases where the connection to their server is being attempted via an employer provided internet connection. In many such cases the encountered blocking is fully intended, since the corporate connection is not being provided for that purpose, and the network administrator will understandably not be inclined to modify the existing firewall rules.

In cases of corporate firewalls, some network administrators may be prepared to modify existing firewall rules to accommodate client requirements, but many, quite reasonably, will not.

In cases where a personal firewall is running on the client's local machine, the client will need to investigate the method of rule configuration and make the required rule set modifications locally.

The following table provides a quick reference of the minimum port access required of an internet connection to enable access to the respective services.

Service Port No. Port Type
HTTP (HyperText Transfer Protocol) 80 TCP
HTTPS (Secure) 443 TCP
cPanel HTTP 2082 TCP
cPanel HTTPS 2083 TCP
Webmail HTTP 2095 TCP
Webmail HTTPS 2096 TCP
FTP (File Transfer Protocol) 20 TCP
FTP 21 TCP
FTP 21 UDP
SSH (Secure Shell) 22 TCP
POP3 (Post Office Protocol) 110 TCP
POP3S (Secure) 995 TCP
IMAP (Internet Message Access Protocol) 143 TCP
IMAPS (Secure) 993 TCP
SMTP (Simple Mail Transport) 25 TCP
SMTPS (Legacy Secure - Officially URD) 465 TCP
SMTP Submission 587 TCP

A complete listing of all transport protocol ports is available at the IANA Service Name and Transport Protocol Port Number Registry.

 

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