What ports are blocked?

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
TCP & UDP port 138
TCP & UDP port 139
TCP & UDP port 445

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 53413
UDP port 11211