- Telnet - Port 23
- DHCP - port 68
- NetBIOS - Ports 135 to 139 and 445
- LDAP - port 389
- Backup software - Port 497
- MS Scheduled Task Endpoint - Port 1025
- SQL Server - Port 1433 and 1434
Note: Above ports are blocked Network wide. Hence, you are unable to run any of your application/web site on these ports.