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Brand new squid server shows many connections stuck in TIME_WAIT

Posted on 2006-07-12
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Last Modified: 2008-02-01
Hi all!

The title really says it all.  I deployed the squid server to a small number of highly used computers yesterday and this morning I checked the server with a netstat -t and saw that several of the computers were still in the TIME_WAIT state.  Is there a way that I could clear them or, better yet prevent the connections from getting stuck in this state permanently?
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Question by:brussell123
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10 Comments
 
LVL 14

Expert Comment

by:pablouruguay
ID: 17091065
do a netstat -np  and check the process that hang the connection
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LVL 14

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by:pablouruguay
ID: 17091071
sorry netstat -ap
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Author Comment

by:brussell123
ID: 17091769
All of the ESTABLISHED connections (except my ssh connection) are associated with squid.  The TIME_WAIT connections just have a "-" in the PID/Program field.
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LVL 14

Expert Comment

by:pablouruguay
ID: 17092017
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LVL 40

Expert Comment

by:noci
ID: 17095716
TIME_WAIT's are half closed connections..., The FIN packet has left your system but the FIN-ACK hasn't been received yet.
so there is no process associated anymore with the socket (hence the - in the PID field).

The problem might be a slow response from a remote system like:

Squid closes the link, your netfilter settings close down a few seconds later but the FIN-ACK hasn't been received yet.
AFTER 60 seconds that socket will get killed too.

Here is a similar reference.
http://www.mail-archive.com/netfilter-devel%40lists.samba.org/msg00644.html
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Author Comment

by:brussell123
ID: 17193627
No luck.  I have resorted to simply ignoring the TIME_WAIT connections.  I have no idea what the max connections of my box is but I really cant think of what else to do except restart the server once a week at night.
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LVL 40

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by:noci
ID: 17344119
I was on holiday since 27-07-2006, and obviously missed the update; if brussel123 want to persue or close I leave it to him
regarding the points there's no real solution only a pointer were to look, and an explanation.
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