What ports need to be open for the license server to work?

Recently our testcomplete license server was moved inside a firewall. Port 1947 has been opened for access but still I cannot get a floating license to a TestExecute client from outside the firewall.

Is there any ports in addition to 1947 that needs to be opened in the firewall for the licensing to work?

Regards,

Stein O. Rasmussen