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PCs call Remote Server via ISDN dial up

By araine ·
Windows 2000 PCs (SP3) call the Head office Servers seemingly of their own accord several times an hour, even at login prompt.
They connect to an ISDN router via a hub.
The 3 servers are running Win2K (latest service packs) also and are 2 controllers and an Exchange file/print server.
PCs - Netbios is disabled over TCP/IP, as is 'Register this connections settings in DNS'.
The Microsoft auto-update service is turned off.
The PCs work locally and/or connect the network domain to pick up email etc.
Tel bills are subsequently high, even though PCs are turned off at night.
The rogue calls seem to be using protocols 1 or 17
(ICMP or UDP).
How can I stop these calls please?

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PCs call Remote Server via ISDN dial up

by RCOM In reply to PCs call Remote Server vi ...

This can be caused by many things. Check to see what services are running. Has there been any recent changes? Has there been anything installed like webshots, IM software or any other web crap that wants to go online? Don't overlook Anti-Virus software as a possible culprit. On my systems the firewall alerts about the virus software trying to access the internet at the login screen.

Is there anything loading from the startup folder that shouldn't be there? Something could load from the registry, so check the run sections.

HKEY_LOCAL_MACHINE/Software/Microsoft/Windows/CurrentVersion/Run, also RunServices.

Also check in CurrentUsers and Users.

If you're firewall sotfware is on the server or if the server has the gateway the situation may be that there trying to access the internet and not connect to the server. There's viruses and other attacks that can cause this. Obviously DAT files should be up to date and a complete scan should be performed. Large amounts of ICMP or UDPuseless packets tie up the system by making it respond to floods of useless garbage. There's a bunch of those out there. Check for anything running that isn't supposed to be there. Look at running services and the event logs for clues.

Maybe you'll find something here that may get you started to solving your problem.

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PCs call Remote Server via ISDN dial up

by hughesm1 In reply to PCs call Remote Server vi ...

Try running an anti-trojan program on your systems. I recommend this one which can be found at download.com: http://download.com.com/3000-2239-10191193.html?tag=lst-0-1 or at anti-trojan.net It comes with a free 15 day trial. Also, I recommend running ZoneAlarm on your machines if you already aren't. It's an excellent firewall program and you can configure it to allow your computer to operate in "stealth mode" where outside requests to your machine will be blocked.

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PCs call Remote Server via ISDN dial up

by hughesm1 In reply to PCs call Remote Server vi ...

One thing I forgot to mention, check your settings as to how often your machines are configured to dial up to check e-mail. Perhaps they are set to automatically check every hour or two, thus the high number of calls placed.

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PCs call Remote Server via ISDN dial up

by araine In reply to PCs call Remote Server vi ...

It now appears that the cause of this dialling is having Outlook XP open on the desktop. Without Outllok open the line drops correctly and about 8 calls per hour are made (I can't seem to stop these). With Outlook open, the line drops BUT is broughtup again every 2 minutes. This only happens on the Outlook XP PCs - not Outlook 2000!

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