I have a windowsystem called "A" and Linux system called"B" .Our application software is client -server software. So in this scenario server part of application is resding in a window system and client part is in linux system.Server is getting some logs through telent connection where telent server is in Linux system and client in in window system. Now come to the problem , i feel it is bit strange.Whats going on is telnet connection between these two systems goes off once or twice in a day, but will establish after one hour. I was searching the reason behind this strange behaviour. I am sure there is no firewall between systems by doing netstat and can see that connection establishes , so probably port also opened(i guess) . Then what will be the reason? as i explained earlier our application server part is a window system and has telnet client, its host file added an entry localhost so with loopback address.So will that make any issues??? or the second reason i am guessing is the listening port is actually open and actively being used, but its backlog of queued inbound connection requeusts has reached its maximum so there is no room available for the inbound connection request to be queued at that moment. Does this make any issue? if so what is remedy? If any body has any reason behind this starnge behaviour post here

1 Answer 1


Windows 2003:

reset ip settings!

netsh int ip reset c:\resetlog.txt

Disable IPv6:

netsh interface teredo set state disabled
netsh interface ipv6 6to4 set state state=disabled undoonstop=disabled
netsh interface ipv6 isatap set state state=disabled

see rule:

netsh firewall show portopening
netsh firewall show allowedprogram
netsh interface portproxy dump

see connection:

netstat -aton | findstr /V /L "*:*" | more

The IRPStackSize parameter specifies the number of stack locations in I/O request packets (IRPs)


IRPStackSize    50(Dec) DWORD
  • will that work? because only certain periods telnet loose connection, rest all time it is working fine.So i would wonder whether it is due to firewall or port problem??your suggestions are highly appreciated
    – vettori
    May 6, 2013 at 4:20
  • @vettori I find it difficult to make assumptions for you. I suggested ways to solve problems that you have described. Increasing the length of the stack will help with the elimination of problems with a queue of packets. Disabling IPv6 and reset can also eliminate some common problems. It is necessary to make the experience and wait).
    – STTR
    May 6, 2013 at 4:40
  • that is great , i am concentrating on IRPStacksize, so probably due to the backlog of queued inbound connection requeusts may be the problem
    – vettori
    May 6, 2013 at 4:42
  • @vettori see to support.microsoft.com/kb/948496/en and support.microsoft.com/kb/912222/en and search disable windows server 2003 scalable networking pack msdn.microsoft.com/en-us/windows/hardware/gg463253.aspx msdn.microsoft.com/en-us/windows/hardware/gg463471.aspx nic driver error problem. Search ndis 6.0 network driver.
    – STTR
    May 6, 2013 at 4:59
  • Fighting W2K2 SP2 reminds me of this ... youtube.com/…
    – STTR
    May 6, 2013 at 5:08

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