Windows 7 No Internet Access Through Proxy
We have started to deploy Windows 7 using Microsoft Deployment Toolkit (MDT) and Deployment Services (we have always used Ghost in the past). Unfortunately we have found (after deploying 60 machines!) that the Internet does not work on a MDT deployed workstation on Internet Explorer 8 or 9 (DVD installed and Ghosted workstations work fine?!).
We are however able to connect to the Internet using Firefox and Chrome, download Windows updates and device drives from the Internet, ping the county councils proxy and connect to the Netsweeper admin console from the affected machines using IE.
Internet proxy settings are set by Group Policy and work fine for XP and Windows 7 workstations that we have installed from DVD or imaged using Ghost.
We have tried deploying a workstation to a workgroup rather the domain (thus no GPOs applied) and after manually entering the proxy information IE still doesn’t work (but Firefox etc. do..)
Microsoft are now involved and although we still have no resolution we have discovered using Microsoft Network Monitor 3.4 that it appears to be an issue related to NTLM authentication as when the proxy asks the second time for NTLM authentication the workstation fails to send another request and simply displays the ‘Internet Explorer cannot display the webpage’ page. It appears that IE only sends the domain and workstation name to the proxy and then fails to respond when requested for the username. On a working workstation IE will send an additional request with domain, workstation name and username and from there the proxy will authenticate and send the page requested.
The question is, has anyone else experienced this issue, either related to MDT or separately? If the answer is yes have you managed to resolve it and what was the resolution?
Any help with this is much appreciated as our Windows 7 deployment is now very much at risk.