Service desk Plus Mail Fetching Exchange 2013

Service desk Plus Mail Fetching Exchange 2013

Currently unable to fetch mail from Exchange using IMAP port 143 get this error

Error while connecting to mail store: javax.mail.MessagingException; nested exception is: java.io.IOException


FAILURE :Email Settings saved successfully. But error occurred while trying to check connection with mail server - Problem connecting to mailbox:[null]

Any help with this would be appreciated 

                New to ADSelfService Plus?