I'm assuming this is exchange 2003. 

A couple of things.

Check your dsierror.log in the tdpexchange directory for any additional
information. 
Is this a cluster environment ?

Verify that your opt file in the tdpexchange directory has the
following:

NOdename          "nodename TSM server has registered"
TCPServeraddress  "TCP server address"
CLUSTERnode       "yes or no"
COMPRESSIon       Off
PASSWORDAccess    Generate
COMMMethod        TCPip
TCPPort           1500
TCPWindowsize     63
TCPBuffSize       32
SCHEDMODE         Polling
INCLUDE * exchange_st

I also launch mine from a cmd file because we are in a cluster
environment.

tdpexc /tsmoptfile="C:\program files\tivoli\tsm\tdpexchange\dsm.opt"
/excserver="exchange instance name"

-----Original Message-----
From: ADSM: Dist Stor Manager [mailto:ADSM-L AT VM.MARIST DOT EDU] On Behalf Of
Nicolas Muurmans
Sent: Wednesday, November 09, 2005 8:06 AM
To: ADSM-L AT VM.MARIST DOT EDU
Subject: TDP for Exchange problem


I have a problem with my TDP for exchange installation.
 
When i start the TDP agent i get this error message:
 
     ACN5237E Unable to communicate with the Microsoft Exchange Server.

The Exchange serve IS installed and is working fine.
 
I first thought that it was an API error in the Exchange server, but
when i use NTbackup it manages to back up the exchange server just fine.
So i think the problem is with the TDP agent.
 
I would be grateful for any thoughts on this?
 
Many Thanks
Nicolas Muurmans