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Cannot access Phone Tools

I am trying to get to the phone tools to view call history and messages.  When I click I either of those, I get the following:

Bad Request

Your browser sent a request that this server could not understand.
Size of a request header field exceeds server limit.


I have no way of getting to missed calls.

No Data
  • I have experienced the same problem, only in Firefox - it has continued working in Edge.  When I selected "Call history" from my account page, I received the same error message as the original poster.  I solved it (at least for now) by going to Firefox Tools->Options->Cookies & Site Data->Manage Data, entering "cox" to select all cookies with Cox in the name, and then "Remove all shown...".