Have Norton Internet Security installed on a couple of Windows PC and a Macbook. Recently the Mac refuse to establish a RDP connection to the Windows PCs. It used to work perfectly. I've tried to troubleshoot and notice that the connection works fine if I disable the firewall on the Mac.
RDP is on the list of trusted applications. I've removed it once and added but still not working except when the Norton firewall is disabled. No problem to establish a connection between Windows PCs running Norton.