Mailing List Message #12796
From: Alex von Thorn <>
Subject: Re: Auto Dialup Issue
Date: Tue, 15 Apr 2003 20:56:58 -0400
To: <>, SIMS Discussions <>
At 11:28 AM +0100 4/15/03, Dene Stringfellow wrote:
Thanks for your input Alex. I haven't heard of this company before!
Now that I have blocked the IP address using the router, will the MacTCP
Watcher software pick up rejected dialup requests?

MacTCP Watcher will tell what the computer is listening for and what the computer is hearing. The advantage of MacTCP Watcher is that it says what ports it is hearing and listening for. Once you have the TCP port, you can figure out what application would be seeking that.

The users do use Eudora
and have their mail client automatically set to check their mailboxes once
every 15-30 minutes. This has always been the case, long before this
automatic dialup to the IP address every 2 minutes started

It's not entirely clear what you mean by "dialup to the IP address". How are you getting this information. Someone else pointed out that dial-up is a layer-one/layer-two connection, so the IP address must be coming from somewhere.

As far as I was aware, the SIMS server only initiates a dialup call when it
wants deliver outgoing email, and the incoming email is handled by the
Mailtron Gateway dialer software which is set to check the incoming mailbox
at the service provider every 30 minutes during the normal working day.

I'm not familiar with this software. (Been a few years since I've turned on my modem.) Maybe someone else has specific knowledge of it.

I'll set up the MacTCP Watcher software to monitor the TCP/IP activity and
see if I get any feedback.

Thanks again.


Alex von Thorn wrote:


 The IP address in question routes to Patheon, Inc. ( in
 Mississauga.  Does that ring a bell for you?

 If you are running a Mac running MacOS 9 or earlier (and that seems
 likely if you're on this list), then your computer is attempting to
 dial out when some application you are running is attempting to
 contact the Internet. If you run MacTCP Watcher, it will tell you
 what ports on your computer are being used. That should tell you what
 application you need to investigate. Basically, what you have to do
 is either shut that application down or change its config so it
 doesn't try to connect when you're offline.

 Mail clients often do this. If you have Eudora or something like that
 set to check mail every N minutes, your computer will dial out.

 At 11:48 AM +0100 4/10/03, Dene Stringfellow wrote:
 >I would be grateful if someone might be able to assist me in trying to
 >pinpoint why one of the mail servers I manage suddenly started to
 >automatically dial out to the IP address every 2 minutes.
 >I managed to stop this by blocking traffic both to and from the
 > IP address in the router. But I have not managed to work
 >out what was causing the mail server ( to initiate the
 >dialup to that address.
 >When I did a reverse lookup on the IP address I got the following:
 >Non-Authoratative response:
 >216.95                              name server = NS2.UUNET.CA
 >216.95                              name server = NS.UUNET.CA
 >216.95                              name server = AUTH01.NS.UU.NET
 >Authoratative answers can be found from:
 >(NS2.UUNET.CA)                     inet address =
 >(NS.UUNET.CA)                      inet address =
 >(AUTH01.NS.UU.NET)                 inet address =
 >Has anyone come across this sort of problem before?
 >Are there tell-tale signs to look for (- other than seeing the router
 >dialing out incessantly)?
 >What measures can I implement to prevent this from happening in future?

 Dene Stringfellow

Alex von Thorn                   
(not speaking in any official capacity for any organization)
Subscribe (FEED) Subscribe (DIGEST) Subscribe (INDEX) Unsubscribe Mail to Listmaster