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Error "Cannot connect to Exchange Server"

Posted on 2008-06-23
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Last Modified: 2010-04-18
Hi,
We recently installed Sharepoint services on out Exchange server, since then once to 3 times a day all users on the network will get an error in outlook "Cannot connect to Exchange Server", at first the message would not go away unless we rebooted the server, we have since found that restarting the Exchange services also fixes the problem, however this is only a temporary fix.

I have uninstalled Sharepoint from the server but it has made no difference.
I have run the DCdiag and Netdiag utilities, the dcdiag comes back with an all clear except for advertising test, it fails on the server as is not advertising as a time server, but the Netdiag comes back fine.

There are no events in the event logs to show a problem with Exchange, or anything else on the system, it appears to be running fine. When the problem occurs you can ping the server by name and ip, you can also connect onto it remotely.

Both Windows Server 2003 and Exchange 2003 are at the latest Service Pack, with all the latest updates. The Hardware is a HP Proliant ML350 G4, Zeon CPU@3Ghz and has 1Gb RAM, the exchange databse is 21.6Gb.

Is there anything else I should be looking at, or any ideas on what could be causing this to happen, I'm not sure if the Sharepoint install is a coincidence or if it caused the problem?
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Question by:mighty_s
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by:r_panos
ID: 21847780
What version of Exchange Server you have, Standard or Enterprise? There's a limit for Information Store size for Standard Edition.

Tha main problem I can consider is the low RAM you have; Exchange is a hungry beast and 1Gb for Exchange and OS is really nothing. It's seems to me that Exchange stops responding. Next time you encounter the problem check out the memory allocation (even with Task manager).
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by:mighty_s
ID: 21853694
Thanks for the response r panos.  Next time it happens I will check the RAM.
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by:mighty_s
ID: 21853723
The Exchange version is SBS 2003.
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mighty_s earned 0 total points
ID: 21863630
Hi, The version is standard edition, and when the problem happens there is no extra CPU usage or RAM/pagefile usage, the system looks as it does normally.
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