I am starting to migrate our Exchange 2010 system to Exchange 2013. Currently we have two 2010 mailbox roles servers and two 2010 CAS servers. I followed the migration guide I installed a 2013 mailbox role server and a 2013 CAS server. On the mailbox role I can not access EAC or ECP. I always get a 404.0 not found if i try the https://servername:444/ecp I get a 400 bad request error. I have tried multiple solutions found online but no joy. The Exchange management shell seems to be working correctly and if I log into the 2013 Cas server admin console it works and sees the 2010 and 2013 mailbox roles any ideas? Capture.JPG
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