Re: FIN_WAIT_2 timeout

From: Andre Oppermann (andre_at_freebsd.org)
Date: 08/24/04

  • Next message: Pavel Gulchouck: "Re: FIN_WAIT_2 timeout" 
    Date: Tue, 24 Aug 2004 12:29:23 +0200
To: gul@gul.kiev.ua

    Pavel Gulchouck wrote:
    >
    > Hi.
    >
    > I have hangs tcp-sessions in the FIN_WAIT_2 state, in which packets
    > sends to remote for several days. Sockstate tells none aboute its,
    > restart httpd has no effect.
    > http://httpd.apache.org/docs/misc/fin_wait_2.html says that FreeBSD
    > has a timeout for FIN_WAIT_2 state, but I don't see it.
    > Number of such sessions grows according to uptime.
    > FreeBSD 5.2.1-RELEASE-p9.
    > Any suggestions?

    Very strange...

    Could you send the output of "sysctl -a net.inet.tcp" as well?

    > root@racoon:~>netstat -na | fgrep 195.248.160.78
    > tcp4 0 0 193.109.240.55.80 195.248.160.78.59843 FIN_WAIT_2
    > tcp4 0 0 193.109.240.55.80 195.248.160.78.56084 FIN_WAIT_2
    > tcp4 0 0 193.109.240.55.80 195.248.160.78.37466 FIN_WAIT_2
    > tcp4 0 0 193.109.240.55.80 195.248.160.78.31848 FIN_WAIT_2
    > [...]
    > root@racoon:~>sockstat | fgrep 195.248.160.78
    > root@racoon:~>netstat -na | grep -c FIN_WAIT_2
    > 419
    >
    > tcpdump shows:
    >
    > 20:43:54.922521 hosting.itpark.com.ua.http > 195.248.160.78.48714: . ack
    > 3765418226 win 0

    It (re-)tries to ACK the FIN probably.

    > 20:43:54.923546 hosting.itpark.com.ua.http > 195.248.160.78.48714: . ack 1 win
    > 65535 (DF)

    And it tries to open the window again to get out of persistent mode!?

    > 20:44:09.920818 hosting.itpark.com.ua.http > 195.248.160.78.31848: . ack
    > 3792205062 win 0
    > 20:44:09.921773 hosting.itpark.com.ua.http > 195.248.160.78.31848: . ack 1 win
    > 65535 (DF)

    Any chance of finding out what kind of Operating System 195.248.160.78 is? 

    -- 
Andre
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  • Next message: Pavel Gulchouck: "Re: FIN_WAIT_2 timeout"

    Relevant Pages

    • FIN_WAIT_2 timeout
      ... Sockstate tells none aboute its, ... restart httpd has no effect. ... FreeBSD 5.2.1-RELEASE-p9. ...
      (freebsd-net)
    • Re: FIN_WAIT_2 timeout
      ... Sockstate tells none aboute its, ... >> restart httpd has no effect. ... >> Number of such sessions grows according to uptime. ...
      (freebsd-net)