Microsoft
Remote Desktop Protocol: 3389 TCP
Windows Remote Management: 47001 TCP
Remote PowerShell: 5985 TCP (HTTP), 5986 TCP (HTTPS)
Microsoft SQL Server: 1433 TCP
Windows File Sharing: 445 TCP
Active Directory: 88 (Kerberos), 464 (Kerberos replication) 389 (LDAP), 636 (LDAPS)
Remote Procedure Call: 135 TCP
NetBIOS: 137 UDP (name), 138 UDP (data), 139 TCP (session)
Citrix
Independent Computing Architecture Protocol: 1494 (application), 2598 (session)
Citrix Licensing Server: 8082 (client), 8083 (server), 27000 (internal)
General
DNS: 53 UDP
WINS: 42 UDP
DHCP: 67 TCP (client), 68 TCP (server)
SSH: 22 TCP