Terminal Services Licensing ports
Everybody knows that for access terminal services it is enough to open just 3389 ports and remote clients will be able to access terminal server.
For terminal services licensing to communicate between two servers there are few more ports that would need to be available.
This is for scenario when you have licensing server in one site or behind firewall.
Application protocol Protocol Ports
RPC TCP 135
Randomly allocated high TCP ports TCP random port number between 1024 - 65535*
NetBIOS Datagram Service UDP 138
NetBIOS Name Resolution UDP 137
NetBIOS Session Service TCP 139
SMB TCP 445
Terminal Services Licensing communicate by using RPC over named pipes. Service has the same firewall requirements as those of the “File and Printer Sharing” feature.