I have a strange scenario that I can't find answers for and would like some help. I am running Windows Serever 2012 R2 with WSUS version: 6.3.9600.16384. I do have an internet proxy in place and have WSUS configured to pass through the proxy server. Synchronizations work fine but once I have approved a security patch it fails to download those required files.
When looking at the proxy traces, I can see that WSUS is trying to download from (example):
http://wsus.ds.download.windowsupdate.com/c/msdownload/update/software/secu/2014/08/windows8.1-kb2988948-x64_6d666d7b2baa07c749f3bbc8322ba9c3a94c0204.cab
Note: added the <> around http:// because I need to validate my account. Unfortunately, I am at work and cannot access my email to verify at the moment.
but the proxy is declining with a HTTP 407 Proxy Authentication Required. Further investigation shows that the proxy credentials are never sent even though WSUS is configured to use proxy credentials and syncs work.
Is WSUS not honoring the proxy settings I have configured? Has anyone found anything to resolve this issue?