A list of common service port numbers (including web, email, and cPanel) is provided below for your convenience. This is helpful in determining which ports to keep open when configuring your software firewall. The following server ports are used by all shared hosting clients, hosting resellers and dedicated server customers.
21 - FTP
22 - SSH
25 & 26 - SMTP
53 - DNS
80 - HTTP
110 - POP3
143 - IMAP4
443 - HTTPS
465 - SMTP (over SSL)
993 - IMAP4 (over SSL)
995 - POP3 (over SSL)
2082 - cPanel
2083 - cPanel (over SSL)
2086 - WHM
2087 - WHM (over SSL)
2095 - Webmail
2096 - Webmail (over SSL)
3306 - MySQL
5432 - PostgreSQL
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