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[QUOTE=haertig;4081763]Unless the cookie was triggering the overdrive.com website to act as a gateway on your behalf that it wouldn't do absent the cookie, the 504 error going away would have been pure coincidence.
e.g., Say the cookie contained your login credentials for my_library, without those credentials my_library would not do a database query for you. And if the database being down was the original problem, you have effectively stopped my_library from trying to access that database for you. The 504 may go away, but you are not in any better situation than you were before. Trying a database query and failing is not any better from your viewpoint than never trying the database query in the first place.
But despite this example of how a cookie might uncover a 504 error, it was probably just pure coincidence that you deleting the cookie appeared to make a difference. It was probably a short term transient error due to overload that caused the 504 (which is what many of them are), and the time it took you to delete the cookie allowed the transient condition to clear on its own.
Wen I had the problem that the cookie deletion solved, I did try Edge and it worked. Went back to Firefox and still the 504 error remained. I deleted the cookies and it was fixed. If it didn't work with Edge, I would not have deleted the cookies had Edge not worked.
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