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Windows 200 Pro is slow over network

By millardv ·
I replaced a NT4 Client that was attached to a Win NT4 Server with Win 2000 Pro Client attaching to the same NT4 Server in the same way and place. Running programs over the network I find an update that took one-half second with NT4 client now takes 4.5 seconds.
I suspect packet size or some TCP/IP configuration with w2k.

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Windows 200 Pro is slow over network

by rikrok66 In reply to Windows 200 Pro is slow o ...

I would suggest:
1.checking the driver for your NIC. Make sure you are running the latest drivers from the NIC co.
2. Make sure you are running only the protocols needed.
3. It could be that the NIC is operating at 10mbs rather than 100mbs.
4. Your server may have been under heavy load
at the time, causing a slow down.

Hope this suggestions help.

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Windows 200 Pro is slow over network

by millardv In reply to Windows 200 Pro is slow o ...

Response:
1. Latest drivers
2. Only TCP/IP
3. Double checked
4. Same symptoms all the time.
-----------------------------
Packet capture shows:
"window size" is 16230 for W2K station and "window size" is 8360 for winNT server.
Is this the problem?
How do I fix this?

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Windows 200 Pro is slow over network

by rikrok66 In reply to Windows 200 Pro is slow o ...

O.k. The problem is that win2k has a default tcp receive window of 17kb for ethernet. NT is set to 8kb. NT is losing packets trying to fill it's buffer. Solution is to reg edit win2k.

Start Registry Editor (Regedt32.exe).


Locate the following registry key:


HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\tcpip\Parameters
On the Edit menu, click Add Value, and then add the following registry value:


Value Name: TcpWindowSize
Data Type: REG_DWORD
Value: 8192
Quit Registry Editor.

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