Following is a list of useful port numbers.
HTTP 80
HTTPS 443
SMTP 25
SMTP (SSL) 465
FTP 21
MySQL 3306
PostgreSQL 5432
SSH 22
DHCP 67, 68
DNS 53
cPanel 2082
cPanel (SSL) 2083
WHM 2086
WHM (SSL) 2087
Webmail 2095
Webmail (SSL) 2096
POP3 110
POP3 (SSL) 995
IMAP 143
IMAP (SSL) 993
plesk 8443
virtuozzo 4643
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