Hi,
Thank you Marc for your reply.
As a matter of fact I am using JavaMail API to handle
my communication to the IMAP server. So all the lower
level sockets, etc., are transparent to me.
Is there a way I can look at this? And why do I see
the sockets being released once I shutdonw Tomcat?
Thanks.
Lumi.
--- Marc Saegesser <[EMAIL PROTECTED]> wrote:
> A socket enters the CLOSE_WAIT state when it
> receives a FIN packet from the
> other side. It remains in this state until the
> application issues a close()
> on the socket. At that point a FIN packet is sent
> and the socket enters the
> LAST_ACK state until the associated ACK packet is
> received. The Stevens
> _TCP/IP Illustrated, Volume 1_ book is almost
> required reading for anyone
> doing TCP/IP programming.
>
> I don't think this is a Tomcat problem, but most
> likely something in your
> servlet code that isn't properly closing down the
> connections to the IMAP
> server (or more probably, not handling the situation
> where the IMAP server
> closes its end of the connection).
>
>
> Marc Saegesser
>
> > -----Original Message-----
> > From: [EMAIL PROTECTED]
> [mailto:[EMAIL PROTECTED]]
> > Sent: Tuesday, August 21, 2001 1:05 PM
> > To: [EMAIL PROTECTED]
> > Subject: imap close_wait with Tomcat 3.2.1
> >
> >
> > I am running a production server with Apache
> 1.3.14
> > and Tomcat 3.2.1. I have developed a
> > JSP-JavaBeans-Based WebMail that runs on this RH
> Linux
> > 7.1 server.
> >
> > While debuging I noticed that if I logout of the
> > webmail (click logout) I see the connection to the
> > imap server being closed. But somehow, after
> several
> > users accessing the site, I notice, using netstat
> -a
> > imap, there is a growning number of close_wait
> > sockets. Eventually I get a connection failure
> > exception if I try to login. That is because there
> are
> > no more sockets available to the server.
> >
> > I read here and there that for some reason Tomcat
> is
> > not releasing those sockets. Does it have to do
> with
> > the possibility that some users just close the
> browser
> > instead of pressing logout?
> >
> > When I stop and start Tomcat I notice that all the
> > close_wait sockets are released. Which makes me
> feel
> > it is a problem with my code/Tomcat's.
> >
> > By any means how can I fix this problem. It is
> getting
> > irritating to repeatedly stop and start tomcat
> > whenever I get that exception.
> >
> > With the site load growing I am affraid that the
> > server will crash every 5 minutes. Now I have to
> > restart every other day.
> >
> > Thanks in advance.
> >
> > Lumi
> >
> > __________________________________________________
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