Blocked network ports

Blocked network ports

In accordance with industry standards and network security we are blocking the following network ports both inbound and outbound. This practice protects you and the network as a whole, it is in line with other providers in the industry.

Port & Protocol
Description
25 TCP
SMTP is unsecured, and Botnet spammers can use it to send spam. We recommend using port 587 for sending outbound email. Businesses with dedicated IP’s may request this to be allowed.
135 TCP/UDP
Windows file share/NetBIOS
136 TCP/UDPWindows file share/NetBIOS
137 TCP/UDP
Windows file share/NetBIOS
138 TCP/UDP
Windows file share/NetBIOS
139 TCP/UDP
Windows file share/NetBIOS
445 TCP
Windows file share/NetBIOS
1900 UDP
SSDP This port is routinely exploited for Distributed Denial of Service (DDoS) attacks


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