We block several outbound Ports for network security.
Blocked by Default
You may request these blocks be removed by opening a support ticket.
- TCP Port 25 (SMTP)
- TCP & UDP Port 137 (NetBIOS Name Service)
- TCP & UDP Port 138 (NetBIOS Datagram)
- TCP & UDP Port 139 (NetBIOS Session)
- TCP & UDP Port 445 (SMB over TCP)
- TCP Port 1688 (Microsoft Key Management Server, inbound only)
Permanently Blocked
These ports are commonly abused for DDOS attacks. These blocks are permanent and cannot be removed.
- TCP & UDP Port 17
- TCP & UDP Port 19
- TCP & UDP Port 1900
- UDP Port 23413
- UDP Port 11211
