We block several outbound ports for network security.
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 TCP port 1688 (KMS, inbound only)
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
We also filter RFC1918 addresses on public NICs.
10.0.0.0 - 10.255.255.255 (10/8 prefix) 172.16.0.0 - 172.31.255.255 (172.16/12 prefix) 192.168.0.0 - 192.168.255.255 (192.168/16 prefix)