Hi Fishmanoz, Fireman_Ian, Thanks for taking the time to reply. I thought I had gone through everything, and indeed I had EXCEPT there was an option on the Windows firewall on XP, I'd not spotted or realised the significance of. There is a tick box marked "Don't Allow exceptions". This was ticked, thus negating me putting the exception in for Railmaster and port 30! In my defence the guide shows Windows Firewall for Windows 7 that is completely different to the one I was using in XP. Still, school-boy error!! *ashamed face* Now to have another look at the Samsung Galaxy S3, having got the Sony Tablet Z working... Thanks again. Tricky