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Hannes de Jager
Asked: 2011-03-01 23:45:17 +0800 CST

What ports does Exchange MAPI use

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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

exchange-2010

2 Answers

  1. Best Answer

    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

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  2. 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.

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