Exchange 2010 OWA Slow

All,

I'm getting lots of complaints from our users that the connectivity to our OWA is very slow. Everytime I check, it seems fine to me, but we have over 20 users in different offices / networks with the same complaint. We're running Exchange 2010 SP1 w/ Rollup 1 on a Windows 2008 R2 box. There's plenty of memory and cpu on this machine so thats definately not the cause. Our Exchange is sitting behind an MS TMG 2010 Server. I did notice in the event viewer on the Exchange server that we had several of these entries: EventID: 5139 Source: WAS "A listener channel for protocol 'http' in worker process '4388' serving application pool 'MSExchangeOWAAppPool' reported a listerner channel failure.

Could this be the cause? Whats the suggested solution? How do I troubleshoot this?

TIA,

LVL 1
rcs81Asked:
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alok-mishraCommented:
Run this commanaf

iisreset /noforce
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rcs81Author Commented:
I've tried that as well, still getting complaints that its slow.
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MegaNuk3Commented:
Slow? What are the users doing that appears slow? Are they external? Maybe time to roll out outlook anywhere.

Or are they doing owa searches and it is slow?
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JuusoConnectaCommented:
I agree with MegaNuk3, what is the defination from users when they complain about the slowness ?

Is it slow with the login ? Slow once your logged onto to OWA ? Have you tried it yourself to confirm that this is for all users and not just a limited set of users. This to determine if it is an server side issue or a client side issue,
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rcs81Author Commented:
Here's the complaint:

When logging into OWA its fast. However when clicking on any of the links ("Inbox", "Sent Items", "Calendar") they have to wait for 1 minute before the page displays the data. These mailboxes have very little data as of now <1mb. OWA speeds up after using it for sometime, but if they close the browser window and try to login in again its back to being slow.

I have not been able to replicate the problem on my end. No issues with Outlook Anywhere. Hope this sheds some light
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rcs81Author Commented:
Forgot to mention that they are external users, no one is on the local LAN.
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MegaNuk3Commented:
have you run exbpa on there to see if it highlights anything?
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e_aravindCommented:
netsh interface tcp set global autotuninglevel=disabled (on the W2k8 servers)
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rcs81Author Commented:
It was a problem with our TMG servers NIC. After swapping out the NIC the problem went away
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rcs81Author Commented:
Faulty hardware
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