Web

HTTP 80
SSL 443
FTP 20, 21
FTPs 990
SFTP 22
Webdisk 2077
Webdisk - SSL 2078
MySQL 3306
MSSQL 1433
Webmin 10000

Email

POP3 110
POP3 - SSL 995
IMAP 143
IMAP - SSL 993
SMTP 25
SMTP Alternate 26
SMTP Alternate 587
SMTP - SSL 465
Microsoft Exchange 691

cPanel - Plesk

cPanel 2082
cPanel - SSL 2083
WHM 2086
WHM - SSL 2087
Webmail 2095
Webmail - SSL 2096
Plesk Control Panel 8880
Plesk Control Panel - SSL 8443
Plesk Windows Webmail (SmarterMail) 9998**

Other

Echo 7
SSH 22
Telnet 23 
Whois 43 UDP
DHCP/BOOTP 68,69 UDP
DNS 53 TCP, UDP
NTP 123
Microsoft RPC EPMAP 135
NetBIOS-ns 137
NetBIOS-dgm 138
NetBIOS-ssn 139
Border Gateway Protocol (BGP) 179
Microsoft DS SMB 445
ISAKMP IPSec 500
syslog 514
RTSP 554
DHCPv6 546, 547
Microsoft DCOM 593
IPP 631
LDAP over TLS/SSL 636
rsync 873
VMware Server 902, 8222
Virtuozzo 4643
DotNet Panel 9001
DotNet Panel Login 80
OpenVPN 1194
Cisco VQP 1589
Steam 1725
Oracle DB 2483, 2484
Symantec AV 2967
XBOX Live 3074
MySQL 3306
Google Desktop 4664
RDP (Remote Desktop Protocol) 4489
PostgreSQL 5432
RFB/VNC Server 5900
IRC 6665-6669
BitTorrent 6881, 6999
Kaspersky AV 8086, 8087
BackupExec 10000
NetBus 12345
Sub7 27374
Back Orifice 31337