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Slow OWA Exchange 2007 over private circuit

Posted on 2013-10-22
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Last Modified: 2013-10-31
I have an exchange server 2007 at a central site.  From the central site I have several other sites connected by fiber to the site where the exchange server is.  Those sites work fine.  I have another site that is using a private WAN circuit.  OWA works fine from any of the sites except for the last one where it takes a long time to load and sometimes it doesn't load at all.  I can even access OWA from outside the organization and it loads fine.  I have checked with the WAN provider and they cannot see anything wrong.  Other web pages load fine.  I ran wireshark and am seeing lots of TCP retransmits for connection to the exchange server but not sure where to go after that.  Any help will be greatly appreciated!
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Question by:DaveKall42
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by:giltjr
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TCP retransmits implies that packets are getting dropped or have long delays.

What is the speed of the WAN link?
What is  the avg. utilization of that link?
Are there other servers/services that site accesses at the central site?  If so, what is the performance like for those?

Do you have a way to do a packet trace on the equipment you own/manage that connects to the WAN provider's equipment?
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by:DaveKall42
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It is a 10Mbps bi-directional link.  It is not utilized that much.  There are other fiber links that run into the central site and have no issues with OWA.  Also I can access OWA from the internet and no issues either.  

I have not done anything except wireshark from a server in the remote location and that is where I was seeing the drops.  It seems to be related to the OWA exclusively from this site.  Internet seems to work ok and ping times are normal.
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giltjr earned 500 total points
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-->There are other fiber links that run into the central site and have no issues with OWA.

What is their bandwidth?

What is your Internet bandwidth?

Does this site access the Internet through the central site, or does it have its own Internet connection?

I would suggest that you do a packet capture from the remote site on the last piece of networking equipment you control.
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by:DaveKall42
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Actually I figured out what the issue was.  It ended up being an mtu issue on the telco level which the addressed and fixed issue.
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