I'm implementing a migration of Exchange 2007 to Exchange 2013 , all but a few users are already migrated.
Some users on Exchange 2013 are requested for password on Outlook. Password is accepted after entering , but again prompts after few hours. There is no particular pattern regarding the type of users ,Windows OS,Outlook version.
When I open the 'Connection Status' , it is stuck on 'Referral' connecting at the first password prompt.
IISAuthentication, Internalclientauthentication , Outlook Anywhere are all on NTLM only.
The password prompt was non-existent initially on Exchange 2013 but after we restarted all Exchange servers during maintenance , users were affected with prompts.
Can anyone help me out?