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@rmondello First: collect some facts.

- Does dns work? simply ping your hostname from am machine that is tethered to your mobile device and see if it gets the correct IP address back
- Try a trace to see if it is a connectivity problem and where the problem starts (not perfectly reliable, but helps a lot) tracert IP-ADDRESS
- Make sure there are no other firewalls or "security" software packages involved on either your machine or the mobile device

With that you should know more.