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Outlook  not connecting to to Exchange after switch failure

Posted on 2011-02-15
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Last Modified: 2012-05-11
Hi Guys

We had a network failure caused by an unknown fault.  We diagnosed the system by restarting each of our switches as well as shutting down our non-critical servers.

Since then two of our 35 users cannot connect to our exchange server.  We are running Small Business Server 2003 with Exchange, and the user is using Windows 7 + Outlook 2010.  We can ping the Primary DC, and our Secondary DC.  Pinging the domain comes back with Sec DC's IP address.  We can force the domain to return the Primary DC's IP using the host file which works.  We have renewed the DHCP address as well as flushed the DNS.

All our other users can connect to Exchange no worries.

Any help would be appreciated.
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Question by:lemonville
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BCipollone earned 500 total points
ID: 34902540
Could always try flushing the ARP tables as well. Can you ping the exchange?... if You type Ping FQDN does it return the correct IP? IF not set the FQN and IP in the Hosts file.

Run outlook.exe /safe and see if it comes up and connects to the exchange. Make sure you check the mail profile to see how it is addressing the exchange server and be sure it can ping and resolve the correct IP for that server.
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by:lemonville
ID: 34902827
Excellent, it would appear deleting the ARP Cache fixed it.  Any idea as to why that would happen? And to only one user?
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by:connectex
ID: 34902914
I've often had issues with ARP tables or/and DNS caching when swapping out switches or routers during business hours. The best option is to clear the table on each system or just to have the user's reboot their system if they have problems after the change.
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Author Closing Comment

by:lemonville
ID: 34903364
Great solution, we should have known but we didn't change any switches, just turned a few off.
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