I have DSL users from remote sites that need to access their mailboxes sitting at headoffice using Outlook. I have two mailbox clusters, CAS and HUB servers. Currently for the first cluster I have port 3012 and 3053 opened - all users are able to connect. The same rules are applied to the second mailbox cluster but dsl users are not able to connect. Definately a firewall issue, because if I move those users mailbox to the first cluster it works. I have also spoken to the firewall guys and have checked that the firewall is dropping connection on 2112 for the second cluster.
When does exchange use these "dynamic" ports to connect? Is it Outlook(IMAP) that uses these ports? I jave searched for the range so I could aske the FW guys to open the range - no luck. A freind has suggested that I get them to open anything greater then 1023?? Should I make the ports static for both clusters since they would maybe change if exchange services are restarted or we failover?