@Wayne-Workman I’ve found the solution late friday night. It wasn’t a FOG problem, but a Windows problem with the proxy settings. FOG seemed to be the only client that used that proxy setting so I found a way to disable it. The registry setting is:

[HKEY_LOCAL_MACHINE\SOFTWARE\Policies\Microsoft\Windows\CurrentVersion\Internet Settings]
“ProxySettingsPerUser”=dword:00000000

This solves the problem for us, maybe it may come in handy for some other users of FOG.

Thank you all for the great support!

Stefan