I was having the same issue on my systems and found this patch for WSUS 3.0 SP2. It was released around the same timeframe that Microsoft change the client on Microsoft Update.
I applied the patch on my WSUS server last night and my clients automatically updated there Windows Update client to what appears to be the same version as listed on Microsoft Update. My machines no longer have the issue and I can switch between checking WSUS and Microsoft Update without issue.
ReplyDeleteI faced the same problem and I got solution from: http://www.microsoftsupportchat.com/blog/post/Error-code-800B0001/