I just upgraded 2 home PC's to Windows 7 and installed UVNC 18.104.22.168 on both and set one to listen on port 5900 and the other on port 9090. On my work laptop (XP SP 3 UVNC 22.214.171.124) that I have connected to my home network, I'm unable to connect to either Windows 7 PC and get the message, "Connection failed - Invalid protocol !". Prior to upgrading both home PCs, my work PC had no problems connecting. When I use Home PC 1 to connect to Home PC 2 using UVNC, I have no problems and visa versa. Both Home PC's belong to the Windows 7 "Homegroup" and they both have Norton Internet Security 2010 installed. Any ideas why the Windows 7 PCs can connect to each other but not an XP PC to either Windows 7 PC?