Outlook times out connecting to server through CISCO PIX firewall
Posted on 2008-11-05
I got a problem with Outlook getting stuck/disconnections when connected to
MS Exchange (intermittant). There's a Cisco PIX 535 firewall (software version 7.22) in between the users and exchange & domain controllers.
I noticed that I could sometimes replicate the problem when clicking on address book or new mail
and clicking on "TO". I found that outlook is connecting to DC(global catalog) to retrieve
address book entries at the time of the problems. Clicking on reconnect (on outlook icon)
or closing and opening outlook solves the problem. All other client applications work with
no problems so the problem only exists with MS Outlook. I managed to capture the problem using Ethereal - I noticed that when the issue occurs there are 'DCERPC TCP RETRANSMISSIONS'. DCERPC inspection is NOT enabled on the PIX firewall.
Any advice would be greatly appreciated.