You need to configure your firewall properly.  With a firewall, you
can define what types of packets can create a state entry on the
firewall.  Typical is syn, syn ack.  Even if there is no state entry,
a new packet should create a new state (not be dropped).  If a new
packet does not create a new state, change the firewall rules so that
it does.  A network dump will tell you what type of packet is going
out; the firewall logs should tell you what type of packet was
rejected.

I could see that this would be a problem if the midtier servers were
behind a NAT.  Is this the case?

Axton Grams

On Tue, Nov 17, 2009 at 12:07 PM, Leihkauff, Kenneth
<kenneth.g.leihka...@saic.com> wrote:
> **
>
> Hello,
>
>
>
> We have a firewall between our MidTier server and ARS system.  The firewall
> is configured to drop tcp connections after being idle for 60 minutes
> (typical/default firewall setting).  Several MidTier user sessions will make
> use of a shared tcp connection so you might have 100 sessions but
> significantly fewer tcp connections.  During idle times (like at night), the
> firewall will discard these idle tcp connections but the MidTier server will
> still retain these tcp references (this can be seen by using “netstat
> –anto”).  So, when users get back on the system, MidTier apparently is
> trying to utilize one of these defunct tcp connections so you end up with
> problems like ARERR 91 rpc timeouts because these tcp connections are broken
> pipes.
>
>
>
> Is there a MidTier/Tomcat or other setting that you have found addresses
> this problem?
>
>
>
> Thanks.
>
>
>
> Ken
>
>
>
> Background:
>
> Version 7.5 patch 3
>
> MidTier – Linux, Tomcat JSP
>
> ARS – Linux, Oracle 10g
>
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