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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 (2.2.9 with mod_jk 1.2.19),
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. We have already upgraded one of
the load balanced web servers to Apache 2.2.14 with mod_jk 1.2.28, and we
intend to do the rest of the next few days. Going through the changelogs
there are one or two items that might have a bearing on the issue but nothing
obvious. Does anybody have any advice on this? Cheers, Darren. Connaught plc is a FTSE 250 company. We are the UK's leading provider of integrated services operating in the compliance, social housing and public sector markets.
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