CLOSE_WAIT Problem

CLOSE_WAIT Problem

[darx kies]

Hi.

I wrote a simple server application and installed it on a linux machine
in Slovakia, running Mandrake 7.2 (2.2.18).
That machine loses tcp/ip packages, as it uses a Microwave connection.
So my server works all the time, and the tcp/ip connections are set to
TIME_WAIT, but after a couple of hours
my server application won't get any connections anymore and the netstat
shows a lot of CLOSE_WAITs that belong to the server.
I've installed the same server on two SuSE 7.1 (2.2.18) machines in
Austria, and the problem never occured.
So does anyone know how to avoid that CLOSE_WAITs, or at least how to
get rid of  them?
Thanks in advance.

Chriss.
----------
The last good thing written in C was Schubert's Symphony No. 9.

re: CLOSE_WAIT Problem

[Dan Kegel]

Chriss wrote:
> I wrote a simple server application and installed it on a linux machine
> in Slovakia, running Mandrake 7.2 (2.2.18).
> That machine loses tcp/ip packages, as it uses a Microwave connection.
> So my server works all the time, and the tcp/ip connections are set to
> TIME_WAIT, but after a couple of hours
> my server application won't get any connections anymore and the netstat
> shows a lot of CLOSE_WAITs that belong to the server.
> I've installed the same server on two SuSE 7.1 (2.2.18) machines in
> Austria, and the problem never occured.
> So does anyone know how to avoid that CLOSE_WAITs, or at least how to
> get rid of  them?

Dunno if this will help, but:

They're supposed to go away by themselves after 2MSL (about 120 seconds).
Other people (on many operating systems) have reported similar problems, btw:

http://uwsg.iu.edu/hypermail/linux/net/9611.2/0043.html
http://www.sunmanagers.org/pipermail/sunmanagers/2001-April/002894.html
http://www2.real-time.com/tclug-list/1999/Jun/msg00254.html
http://mail-index.netbsd.org/netbsd-bugs/1996/04/16/0004.html

The last one has a fix for an old bug in netbsd that could cause this.
- Dan