Master Win7 - slave XP won't connect

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Hello,

I've used TeamViewer even between countries and it has performed perfectly!! This is a great product!!

Unfortunately, the latest connection I tried didn't work.

Tried to connect a master "TeamViewer Portable" on a Win7 x32 pc to a slave "TeamViewerQS on an XP Professional x32 pc, in another country. After entering the "Partner ID" & pressed connect, it didn't do anything for a long time (the "light" at the bottom was yellow and stated "connecting...").

This is unusual because I'm using the same master "TeamViewer Portable" on a Win7 x32 pc to a slave "TeamViewerQS" on Win7 x64 pc in another country, all the time and it works flawlessly...

Any suggestions?

Thanks in advance.
G.