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Firewall Ports#

• 20 FTP (Consider SFTP over SSH as is more secure than FTP)
• 21 FTP (Consider SFTP over SSH as is more secure than FTP)
• 22 SSH (Consider switching SSH to a different, non-standard port for security reasons)
• 25 SMTP (some ISPs block port 25 so that a mail client cannot reach the mail server to send mail)
• 26 SMTP (alternate SMTP port option – see notes for port 25)
• 37 rdate (needed to retrieve date and time information)
• 43 whois (part of generic DNS features)
• 53 bind (DNS)
• 80 http (Apache / Web)
• 110 POP3 (Email)
• 113 ident (authentication)
• 143 IMAP (Email)
• 443 https (Web / HTTP over SSL)
• 465 SMTP (TLS/SSL)
• 873 rsync (remote sync)
• 993 (IMAP SSL)
• 995 (POP3 SSL)
• 2083 cPanel (SSL encrypted)
• 2087 WHM (SSL encrypted)
• 2089 Licensing (Must be open to contact license server)
• 2096 Webmail (Horde, Squirrelmail)
• 3306 MySQL (MySQL remote connections)