Exchange 2013 EAC shows "error Sorry, your request couldn't be completed. Try deleting the cookies from your browser, and then sign in again. If the problem continues, contact your helpdesk."

Hi,

My Exchange 2013 Hybrid environment is at CU5 level. Multiple administrators have started experiencing the error message

It only started two weeks ago and did not coincide with any infrastructure changes. The message occurs when clicking anything on the EAC GUI and it eventually allows you to perform the operation but only after the message pops up a few times.

I have tried clearing the browser cookies, history, etc. Note that using the Office 365 EAC does not yield the same messages and it only happens in IE (IE 11).

Thanks.