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From "Darren Kukulka" <Darren.Kuku...@connaught.plc.uk>
Subject FW: Apache Close-Wait issue
Date Thu, 29 Oct 2009 07:35:59 GMT
No one willing to touch this one?  I thought I'd get at least a passing
comment...:-(

-----Original Message-----
From: Darren Kukulka [mailto:Darren.Kukulka@connaught.plc.uk] 
Sent: 27 October 2009 12:14
To: users@tomcat.apache.org
Subject: Apache Close-Wait issue

Hi All

 

Got an interesting problem which has occurred several times now..

 

Painting a brief picture ;

 

Several applications running on Tomcat 6.0.19 (64-bit) - several cluster
groups

Backend SQL Server 2005 clustered DBs (several)

Front end Apache Web servers, load balanced via secure network appliance

 

Basically, we have an issue with one of the DB clusters which stops
servicing requests from the app servers

 

The app servers can continue to connect to remaining DB clusters OK.

 

The problem is that all the web servers stop responding to external
requests.  Looking at the ports in use on each server, there are a
number of established sessions between Apache and Tomcat, which seems
OK.  All of the web servers also have exactly 30 close-wait sessions
with the secure network appliance.  We think this is what is stopping
any requests from being services by the web servers.  However, even
trying to browse locally on each server to the root just times out.

 

We do not enforce keepalive or timeouts for TCP/HTTP, and we use
practically all the defaults for these directives.  All web servers are
configures identically.

 

I can't find any reference to a directive that may limit connections to
30.

 

Restarting the web servers allows users to get to applications using the
good databases.

 

Does anybody have any advice on this?

 

Cheers,

Darren.

 



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