Session disconnected error

Session disconnected error

I got IOS PocketCloud Pro on my iPad Air and PocketCloud companion installed on Windows PC Vista 7 Home. I get automatic detection of the PC so it appears on my iPad (via gmail). I have checked the username and password of the PC and they are properly entered on the iPad. The icon says VNC which I assume Pocket Cloud installed automatically on the PC. The iPad is on my home network and the PC on a different home network 300 miles away. I can connect via Skype between the two...

I cannot initiate a first session. I always get Session Disconnected error message. Where do I start troubleshooting as the error message is very laconic with no details...??

Thanks,

Ivan

P.S. my 78 old mother installed the companion on her PC. I could not visualize the installation but from her comments (via Skype) the installation ran without errors...