exchange 2007 acting weird

I have an exchange 2007 sp1 running on windows 2003 standard r2 sp2.

i have a very strange problem - i don't even know where to start.

some work stations connect fine, others don't connect at all. it seems the server is bogged down.
I have about 12 users that are affected. some run outlook 2003/others outlook 2010.

OWA works fine on most workstations. Except one user that can't connect via outlook and owa url never resolves. help please! :(

most workstations are xp pro sp3. couple of windows 7.  both are affected.

what could be causing this problem? could it be a virus?
fstincAsked:
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fstincConnect With a Mentor Author Commented:
The problem was a bad switch and incorrect MAC address on the ARP table. had to server cables to another switch and clear and update the arp table on affected workstations.
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WayneATaylorCommented:
Sorry but would really need more information reallyhh to be able to help with this...

But first check that all Exchange services are started OK (I tend to sort by Start type and go through the ones set to automatic to check they are all started)

There should maybe be some entries on System or Application event log on the server, so worth checking there.

You can check the status of the Outlook connection by pressing Ctrl key and then right clicking on the Outlook icon in the notification area (bottom right) and selecting "connection status".  Are any of the items showing connected. They all need to be connected to get a proper connection.

Wayne



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Dustin_LoftisCommented:
Sounds like a DNS problem.
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fstincAuthor Commented:
outlook connects to DC but can't connect to the mail server
all services are running for exchange.
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fstincAuthor Commented:
Dustin: how do I rule that out? (DNS)

i can ping my servers and they resolve. i've flushed dns on my workstation.
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Dustin_LoftisCommented:
On the machine where the OWA never resolves and you can't access Outlook, check the DNS server settings, and try to resolve the Exchange server's FQDN (server.domain.local) by pinging it.

You can also run some tools like dcdiag.exe on your domain controllers.  If there are any issues shown, post the sanitized result here.

Ensure your Exchange server's DNS settings are correct, as well.  Restart the DNS server service on your DCs.
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fstincAuthor Commented:
DNS is working fine.
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fstincAuthor Commented:
solved problem.
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Dustin_LoftisCommented:
That would certainly explain it. :)
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fstincAuthor Commented:
yeah. it was a difficult problem, in my opinion, as I had only applied a few updates and not everyone was affected. as soon as i switched the cables to the other switched, everything came back online normally. then i had to update workstations with arp -s commands.
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