We had traced such behaviour in our network to a couple of Win95 PCs from a
particular segment. The TCP/IP software on the PCs occasionally misfired the
packets when users tried to connect to the database. We were told that the
PCs were heavily loaded with other local software that interacted with other
n/w applications. The listener would receive some of the packets and would
wait for the rest which never arrived, thus causing it to hang. Would not
even respond to 'status' command. Killing it and restarting was the only
choice.
- Kirti
> -----Original Message-----
> From: Jared Still [SMTP:jkstill_at_bcbso.com]
> Sent: Tuesday, May 23, 2000 1:12 PM
> To: Multiple recipients of list ORACLE-L
> Subject: Re: TCP listener not responding
>
>
> Yes, we have experienced something similar on occasion.
>
> Our listener(s) would just not respond. Everything else
> would indicate that all was OK.
>
> 'lsnrctl status' would report that the status was normal.
>
> Until stopping/starting the listener, remote connections
> could not be made to the database.
>
> Thankfully, this only happens rarely. Sorry, we've never
> been able to track down what was the cause of this behavior.
>
> We suspect it was due to network problems we were experiencing,
> ( DNS in particular ), but could not prove it.
>
> You may want to look at networking issues.
>
> Jared
>
> On Mon, 22 May 2000, Campbell, James wrote:
>
> > Hello list(en)ers,
> >
> > while I start ploughing around in documentation, does anyone out there
> have
> > an experience fresh in their memory of a tcp listener ceasing to
> respond?
> >
> > Oracle 7.3.4.3.1, HP-UX, and it has only started doing this since
> Friday.
> > The listener log shows no error messages, 'lsnrctl' command 'status
> > tcp_listener' hangs, and the only way I can get anything to happen is to
> > 'kill' the listener process and re-start the listener. Then it works for
> > about 5 minutes before it goes AWOL again. I think it's a network
> problem
> > rather than specifically a listener or database problem, would anyone
> care
> > to offer any alternative suggestions?
> >
> > Regards,
> > James Campbell
> > --
> > Author: Campbell, James
> > INET: James.Campbell_at_ca.com
> >
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Received on Wed May 24 2000 - 09:00:58 CDT
