terminal server client mac

Hi.

We have a mac and try to connect to Windows server 2008. There is a Ciso Firewall and the port 3389 is open for RDP.

We get the message "The connection tothe Windowsbasseconditionedcomputer was brokenbecause therewas a problemin connection with thelicensingprotocol"

Then we try to antoher Windows server 2008 but there have we firewall linksys and all works.

Must Mac and rdp have more ports open in the firewall or must some other service be start on the terminal server?

Best regards

Rolf Andrén