Network connection problems

From: Tim Payne (tim_at_branded3.com)
Date: 09/22/04 

Date: Wed, 22 Sep 2004 10:52:39 +0100

I wonder if I could trouble you guys for some advice?

We have a machine that acts as the internet gateway for our office. This
week it's been behaving rather oddly. It seems to be clogging the network so
that all the other machines in the office struggle to connect to the
internet (and if left on long enough causes problems for the entire
building), and when they do get access is very slow and things like images
don't load. Access the sites or FTP from the gateway box works fine as you'd
expect, but for everyone else access is intermittent.

I've checked the machine for viruses and trojans, but can't seem to find
anything obvious. The only suspicious thing is that about the time this
started we get a blank 'ok' confirmation box at startup. It shows up in the
event log, but doesn't have any information against the event, other than
'Application Popup: :' as the name of the event. Running Spy++ on the alert
seems to indicate that it's being spawned by the CSRSS process, but it's
slightly suspicious that it's only started doing this at the same time that
we've been having network problems.

Another odd issue is that some websites that can be acccessed fine on the
gateway box, come up with DNS errors on the other machines on the network.

Does anyone have any ideas what this could be? Networking's not my strongest
point, and I'm running out of ideas! Any help greatly appreciated.

:)

Tim.

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