SharePoint: “HTTP 400 Bad Request (Request header too long)” Error Fix

I recently came across this issue on our internal SharePoint deployment and tried a few things to fix it without success. Initially, I thought it may be to do with the sheer quantity of Active Directory groups I was a member of, however after reducing the number of groups I was a part of there didn’t appear to be any change in the issue.

After looking around and attempting a few fixes I finally came across why the issue occurs and how to fix it. I’ll cover all of this in this article.

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