Tcpip window size exceeded

[Lung]

I am trying to connect from MSDOS6.22 to HPUX11.11. On the HPUX side, it returns a RST with "window size exceeded".

What is the cause of this and are there any workarounds?

Below is the summary of the sniffer trace:

Summary
Bytes Rel Time Delta Time Abs time
---------------------------------------------------------------------------------------------------------------------------------------------------------------------
310 # [196.0.0.202] [10.0.50.10]
Expert: Window Size ExceededTCP: D=1026 S=4074 RST ACK=263957 SEQ=0 LEN=11 WIN=0
65 0:00:48.622 0.000.053 3/23/2005 11:29:04 AM
ADDR HEX ASCII
0000: 00 09 7b 61 10 8a 00 30 6e 46 75 2c 08 00 45 00 | . {a...0nFu,..E.
0010: 00 33 22 41 40 00 40 06 17 b0 c4 00 00 ca 0a 00 | .3"A@.@..°......
0020: 32 0a 0f ea 04 02 00 00 00 00 00 04 07 15 50 14 | 2..ê..........P.
0030: 00 00 5a 83 0c 4f 4e 6f 20 6c 69 73 74 65 6e 65 | ..Z..ONo listene
0040:

[harry d brown jr]

Connecting how? (telnet, ftp, ...)

your HPux box is up to date in patches??

the exact error message is?

live free or die
harry d brown jr

[Lung]

The DOS machine is initiating the make call, while the HPUX is listening. It's basically a tcpip socket connection. The connnection is made via dialup, so between the 2 machines, there are 2 routers.

Any help/suggestions would be appreciated.

Thanks!

[shankar_3]

hi lung,


This basically the amount of date that can be tranmitted without being acknowledged is called the TCP window size..

We can modify this value by

#ndd -h supported

wiil give the output of all tunable supported parameters.

We can modfiy these value.

This comand help you to fine tune the TCP-IP.

With cheers,
Shankar

[Ron Kinner]

The end of the message seems to want to say No listener which is essentially equal to a window size of 0. Could it be there is no process listening on the port you want to use?

netstat -an | grep x

where x is the port number.

Perhaps a firewall somewhere in the chain refuses to allow connectons to this port number?

You might try te4portping:

http://www.tools4ever.com/products/free/command/

see if that sheds some light on the subject.

Ron

[rick jones]

I think Ron is on the right track here - HP-UX 11 and later will by default put text into the RST segment indicating the reason the system sent the RST segment. It does indeed look like there was no application with a LISTEN endpoint bound to the port to which the MSDOS system was trying to connect.

That window size exceeded is a probably a red herring from the utility.