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Modem auto dialling ISDN line in Win2K

I have a small home network of 2 Win2K and one WinXP Home systems, connecting via ISDN to the internet. The home network is Static IP based, using TCP/IP

Net BIOS is enabled over tcp/ip so that the shares between the machines work properly. DNS is not set on any machine and all three systems have Windows Update disabled, are set to not register their connections with DNS.

At random intervals, the gateway system dials the Internet, sometimes only once, but sometime repeatedly. no single action on any system seems to trigger the event and no consistent pattern is observable.

A packet sniffer is not showing anything unusual.

The ISDN automatically assigns DNS etc on connection. I have had to disconnect the ISDN from the socket as the last time it dialled, it did not auto-disconnect as it is set to do and stayed connected for almost 12 hours.

Any ideas how to track down the culprit
1 Solution
Have you scanned for spyware ?

Online virus scan











Free AV software





Commercial AV software







Etrust EZ









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Have you checked your Tools> Internet Options> COnnections in Internet Explorer?
Windows Updates, Virus Scanner Updates, Real Player and other applications like to "phone home".
(You do have anti-virus software, right? If not, start there as worms and trojans can kick a connection off too)
If you're set for automatic connection, that could be the problem.
If not, check for spy/adware/dialers  - i lke spybot, there are a bunch of utilities here:

If a sniffer reveals nothing, then I'm guessing the sniffer is misconfigured (*something* is attempting to send traffic, right?)

A personal firewall may also help you to determine what traffic is initiating the connection, if properly configured.


asparakAuthor Commented:
I have checked for Trojans etc, have Norton Anti Virus installed and all apps that I can find, including Update are set to request permission before dialling. I have checked all Network cards on the LAN to make sure none are set to register their connections.

Pest patrol is not reporting any spyware.

The Packet sniffer (Ethereal) is configured properly and is not detecting any traffic I wouldn't expect to see.

Any other ideas.
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