Recently we were unable to log into ECP, after successful login we a re redirected to de login prompt, on our two Exchange servers and no configuration change were made, we are using a wildcart cert on them and running in an hybrid config with Office365.
After trying recreating ECP et backend directories and checked the auth settings on them the problem still persisted.
So i went on throwing a new exchange server in the party, and then when i set the wildcard cert on it , i got the redirect loop as for the others servers, i reverted to a self signed cert to access ECP.
Anyone with a clue about this? Thanks.