Windows 2000 Terminal Server sends TCP reset to clients

[Vasoo Veerapen]

Good day people,

I have a severe problem with a Win2K terminal server farm reseting
remote client RDP connenctions. There are 5 terminal servers running
in an NLB config, with all servers patched SP3. I have tried to patch
with SP4, but this slowed down the servers completely and made them
unresponsive. There are also tons of hotfixes to apply as per the
Microsoft site, so SP4 is not an option.

FYI the remote users are connecting to the farm via Frame Relay,
Wireless and there are some users on the local LAN. The problem seems
to occur more for the people on remote sites using wireless and FR.
However, not everyone on the remote site is disconnected at the same
time. Different users at remote sites seem to be randomly disconnected
at different times.

The setup was working for almost a year, but an upgrade on the
wireless system last week seems to be the trigger for this problem

Using a network sniffer I am seeing TCP reset packets being sent to
connected clients for no apparent reason, even when people are hard at
work.

Suggestions anyone?

 

[Matthew Harris [MVP]]

The new wireless system may have a little bit more latency
than normal. Have you tried turning on keep alives and
adjusting the value of TCPMaxDataRetransmissions from 5 to
10?

http://www.microsoft.com/windows2000/techinfo/reskit/en-
us/default.asp?url=/windows2000/techinfo/reskit/en-
us/regentry/58805.asp

http://support.microsoft.com/default.aspx?scid=kb;en-
us;216783&Product=win2000

-M

 

[Vasoo Veerapen]

It works!

Here are the registry settings which enabled us to get back on line.

[HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\Terminal Server]
"KeepAliveEnable"=dword:00000001
"KeepAliveInterval"=dword:00000001

[HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\Tcpip\Parameters]
"KeepAliveInterval"=dword:000003e8
"KeepAliveTime"=dword:0001d4c0
"TCPMaxDataRetransmissions"=dword:0000000a

As always,

Thanks.