One fix from Alex says is to reboot your computer to resolve this issue.
Another
If the issue persists, or returns, another fix I have is from Ticket 1023528
From IAMO:
"If the problem is only chrome, the error we've seen in the past is that his requests exceeded the header size limit.
If the user only sees this problem in Chrome, it's a known problem with the browser outlined here - https://productforums.google.com/forum/#!topic/chrome/G82JDzzoRio.
That URL also has suggested steps to fix the problem.
If the user still sees the error - please provide the user's IP address and exact steps taken to authenticate."
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