Outlook connectivity issue with Exchange 2013

Hi All,

I am running primary site and DR site. In primary site have one CAS server with two Mailbox servers with DAG. In DR site have One CAS server and One Mailbox server which is part of primary site DAG. All infrastructure is on Hyper-V and all exchange machines are on virtualization.

Before deploying Exchange server in DR Site, outlook users were connecting normally and didn't face any issue. After installing Exchange server in DR site the connection of outlook is too slow that taking approix 15 mins to connect with Exchange server.

Kindly guide that what happens and how to troubleshoot this issue.

Thanks in Advance