What version of Winsock is the client running. I had a handful of
users with cheesy modems that once we upgraded them to Winsock 2
and DUN 1.3 they were okay. Before they were timing out.
Dusty
----- Original Message -----
From: System Administrator <[EMAIL PROTECTED]>
To: <[EMAIL PROTECTED]>
Sent: Tuesday, June 22, 1999 2:18 PM
Subject: RE: [IMail Forum] POP3 Concurrency limit problems???
> We have done the increasing of the timeout value, to no avail. I access
the
> mail server over the network, and have had no problems at all, but I get
> about 10-15 calls a day with dial up users having problems. Customers
with
> 2 phone lines will do it when I'm on the phone with them, and the lights
> that blink in the systray just stop blinking when retreiving large
> attachments. If they open up a browser, the browser works fine.
>
> Am I looking at a problem with the mail server, or a possible problem with
> my switch?
>
> __________________________________
> Justin Ellison
> System Administrator
> InternetUSA
> [EMAIL PROTECTED]
> http://nebi.com
> 800-603-3502
>
> > -----Original Message-----
> > From: [EMAIL PROTECTED]
> > [mailto:[EMAIL PROTECTED]]On Behalf Of Daniel Donnelly
> > Sent: Tuesday, June 22, 1999 10:30 AM
> > To: [EMAIL PROTECTED]
> > Subject: Re: [IMail Forum] POP3 Concurrency limit problems???
> >
> >
> > No, the number of user accounts is not your problem.
> >
> > I'd say that those clients that expect attachments should have the 'time
> > between POP3 checks' set to be greater than the time to download
> > all messages
> > and attachments. Many clients today come with this set to 1
> > minute or shorter
> > and that is much shorter than necessary and WAY too often for
> > normal mail. Set
> > to 5, 10 or 15 minutes, depending on network connection speed (longer
for
> > slower connections) and the time to transmit the attachment size
> > you expect.
> > If the user is dialup and expects 1Meg attachment, that could
> > take 10 or more
> > minutes, so set to 15 minutes between mail checks. On a local
> > network with the
> > same 1 meg, it could be 1 minute, but I'd still recommend it be set to
at
> > least 5 minutes. There is no need to check a mailbox every minute or 2.
> >
> > Please note that this would, in effect, reduce the number of concurrent
> > connections, too. (users checks less often, so less checks are
> > being performed
> > overall and at any one time).
> >
> > If one telnets to POP3 server, there are some numbers at the end
> > of the '220'
> > line. The first shows number of connections since last restart
> > and the second
> > shows the number of current connections. Even in systems with
> > lots of users,
> > the second number usually ranges around 15-25.
> >
> > Daniel Donnelly
> > Ipswitch Technical Support
> > ________________________________________________________
> > See our Knowledge Base at http://support.ipswitch.com/kb
> > URL for List Servers: http://www.ipswitch.com/Support/mailing-lists.html
> >
> >
> > In reply to 21 Jun message from [EMAIL PROTECTED]:
> >
> > >I am dealing with an irritating problem of customers getting
> > >disconnected from the mail server during a download of a large mail
> > >attachment using a POP3 client. I'm running Imail 5.04 on WinNT 4 SP5
> > >on a Pentium II 333 with 128MB RAM. I found the following article on
> > >the kb at: http://support.ipswitch.com/kb/IM-19980119-DD02.htm
> >
> > >Question/Problem: How many concurrent connections can IMail Server
> > have?
> >
> > >Answer/Solution: Somewhere around 500 concurrent on POP3, 400
concurrent
> > >on
> > IMAP4. 1000 concurrent on inbound SMTP connections, 500 concurrent on
> > >Web Messaging. These are approximate and are based on a Pentium 200
with
> > >64
> > mb of memory, 256 mb of swap space and 1 gb free disk space, NT 4.0
> > >server, no other apps running, one test at a time.
> >
> > >There are no actual programmed limits (except in Web Messaging @ 500)
> > >and are dependent on lots of variables.
> >
> > >We did write a test app a long time ago and can far exceed the numbers
> > >specified above but performance degrades around the numbers given.
> >
> > >The nature of POP3 (in normal delete mode) and IMAP4 (in normal
> > >disconnected mode) allow a considerably higher number of "apparent"
> > >concurrent users. The numbers above are for actual concurrent
> > >connections. Real use would provide "apparent" numbers higher than
> > above
> > >(except web messaging).
> >
> > >We have only about 3,500 users on our server, could this be my problem?
> > >Is
> > there any way to monitor how many concurrent POP3 sessions are
> > >active?
> >
> > >________________________________
> > >Justin Ellison
> > >[EMAIL PROTECTED]
> > >Internet USA, LLC
> > >234-6413
> > >800-603-3502
> > >http://nebi.com
> >
> >
> >
> >
> >
>
>
