Exchange 2010 and Service Desk mail fetching

Exchange 2010 and Service Desk mail fetching

We have bought Service Desk plus (on-Prem) and I can not figure out how to configure email fetching from our exchange 2010 servers I keep getting FAILURE :E-mail settings saved successfully. But an error occurred while trying to check connection with mail server - Problem connecting to mailbox.

                  New to ADSelfService Plus?