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From: bugzilla@apache.org
To: tomcat-dev@jakarta.apache.org
Subject: DO NOT REPLY [Bug 39600]  New:  - A lot of connection in TIME_WAIT
 state on Tomcat clients
Message-ID: <bug-39600-78@http.issues.apache.org/bugzilla/>
Date: Wed, 17 May 2006 15:43:56 +0000 (GMT)

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http://issues.apache.org/bugzilla/show_bug.cgi?id=39600

           Summary: A lot of connection in TIME_WAIT state on Tomcat clients
           Product: Tomcat 5
           Version: 5.5.12
          Platform: Other
        OS/Version: Linux
            Status: NEW
          Severity: major
          Priority: P2
         Component: Catalina
        AssignedTo: tomcat-dev@jakarta.apache.org
        ReportedBy: lionel.agulhon@club-internet.fr


Each client connection performed on our Tomcat server is in TIME_WAIT state on
client (even if the client is the Tomcat server itself). We have studied the
network capture and we found an abnormal behaviour :

When the client send the FIN segment, Tomcat server reply with a FIN segment
instead of ACK. So the client send ACK and enter in TIME_WAIT state and it's a
ugly behaviour when the client server support a hudge traffic (during a stress
campaign we have reached 21000 TIME_WAIT connection !). In the TCP RFC, Closing
a TCP session is always a 4 way handshake (->FIN,ACK ->,FIN ->,->Ack).

you can easly reproduce : 
perform on the tomcat server : telnet localhost [tomcat_port]
GET /toto \n\n
perform : netstat -an |grep [tomcat_port]
you should see a connection in TIME_WAIT State.

Thanks for help, Rgds.

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