Again just posting this without knowing if it will fix your issue. Might be nothing but its always a step i take when having login issues.
On most Windows machines you can get to a DOS prompt by going to START > Search “CMD” > Open CMD option that appears under 'Programs.'
At the command line type C: to inusure you are applying commands to the local PC. Then, after the C:\> first type “CD\” and hit ENTER - this will get you to the root. Then type “ipconfig /flushdns"
Just a thought
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