Take the 2-minute tour ×
Server Fault is a question and answer site for professional system and network administrators. It's 100% free, no registration required.

What ports does Exchange MAPI/CDO use to connect to the Client Access Server from the Mailbox Server. I have a piece of software installed on a Mailbox server that uses Exchange MAPI (RDO to be specific, which uses Exchange MAPI). The problem is I'm running into MAPI_E_NETWORK_ERROR problems so I was wondering if there might be firewall issues i.e. the Client Access Server (CAS) cannot be accessed properly from the Mailbox server by MAPI. what ports do I need to check in the firewall configuration? This is on Exchange 2010

share|improve this question
add comment

2 Answers 2

up vote 3 down vote accepted

MAPI actually uses RPC which uses a dynamically assigned port number. Here's a blog posting that will help you make that port number static:

http://social.technet.microsoft.com/wiki/contents/articles/configuring-static-rpc-ports-on-an-exchange-2010-client-access-server.aspx

share|improve this answer
    
Thanks, does it use only RPC? –  Hannes de Jager Mar 1 '11 at 8:41
add comment

Check whether your Client Access servers are requiring encryption (use Get-RPCClientAccess to see). I've encountered problems with third party apps that don't support RPC encryption when the CAS are enforcing it.

share|improve this answer
    
Thanks, already checked that. As far as I know this encryption settings is now actually on by default in 2010 whereas is was off by default in previous versions. –  Hannes de Jager Mar 2 '11 at 7:17
add comment

Your Answer

 
discard

By posting your answer, you agree to the privacy policy and terms of service.

Not the answer you're looking for? Browse other questions tagged or ask your own question.