The webmin ssh/telnet login seems to be the best choice.
Putty doesn't seem to offer any facility for that.
Have you set up java to use your auto-config proxy settings?
On windows, it's Start/Settings/Control Panel/Java.
General tab / Network settings.
The webmin module also relies on a few popup windows, so that may be something to check on. When you say the webmin connection "does not work", does it make any progress at all?
You can call me Bill
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1 F?? workstation, 1 XBMC PVR and two Win7 workstations.
Too many other pc's - some that are even still running.