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Partially Very Slow Network Access

Posted on 2011-09-27
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Last Modified: 2012-05-12
I have a network speed problem I cannot figure out.

I have a Windows network with Dell W7 clients and Dell W2K3 and W2K8 servers connected with Avaya  GB switches.  Most are working at speed.  Problem is any machine I logon to seems to run VERY slow when connecting to a specific W2K3 server.  This particular server runs a SQL MRP clinet/server db and is also a print server.  Literally no one else is experiencing this problem.  When I copy files to/from that server and my desktop, initiated from my machine, I am seeing 100 - 500 Kb throughput.  When I copy files from that server to/from my machine, when initiated from the server, I see Gb throughput.  When I copy files from my machine to/from any other workstation or server, initiated from my machine, I see Gb throughput.

When I try to run the MRP client, from my machine, the logon screen takes upwards of 8 minutes to load but is up in 8 or less seconds on all other workstations.  When I access the MRP client from a Terminal Server the client loads in 8 or less seconds too.

This machine also server as a Distribution Point for AD software installs and workstation imaging.  When I start an image it now takes 8+ hours and completes with failures and missing packages.  This process used to take less than 30 minutes.

Everything used to work!  Who did I piss off?

I have tried moving my switch side port to different ports and different switches in the stack with the same problem continuing.

Help!

Tim
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Question by:gibneyt
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by:iwaxx
ID: 36715662
Have taken a network capture to check for errors ?
You might find evident errors such as DNS timeouts or a lot of retransmission that might lead to a TCP problem.

I got such a problem with problem of speed with different OS that was due to a mismanagement of the TCP Windows Scaling at some point.

Check the part "TCP Auto-Tuning" in the following article and play around with the command:
netsh int tcp set global autotuninglevel=(disabled|normal|restricted ...)

http://www.speedguide.net/articles/windows-7-vista-2008-tweaks-2574

But you should take a network capture of a file copy for example, to find out the explanation of the slowness and have more details about your problem ...
Slowness are a challenge to troubleshoot !
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by:SteveJ
ID: 36717015
I agree with iwaxx. You need a capture to diagnose this kind of problem. Any time that you see multi-minute response it's very likely network timeouts of some sort.

Good luck
Steve
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Accepted Solution

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gibneyt earned 0 total points
ID: 36717766
I found a forum with a fix http://forums.techarena.in/windows-server-help/709308.htm.
I started the firewall service.  The ICS service had to be started first so I OKed that.  WiIdndows Firewall came up with the Firewall off.  I left it so and tried all the issues I had been seeing and they were all resolved.

what gets me is that I was the only one to see these issues.  Everyone else has W7 just like me.  Don't get it but it is back to normal now.

Regards,
Tim
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Author Closing Comment

by:gibneyt
ID: 36902239
Finally tried the right search terms to call up a previous fix.
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