OK guys hold on to your hats this is a long one. I have an office with 4 PCs all running WinXP Pro, sharing an ADSL connection trough a router/modem, and all connected through a small switch. We started having problems with the Internet going down. I am not sure that it is going all the way down, because it starts to slow and then rapidly just goes no more. It seems to take a while for the error page to pop up in IE so I thought that maybe it was a DNS server problem but I checked and they all seem fine. If I turn the router off and on it works fine for about an hour or so. I had the phone company test the signal strength and it tested great and all filters are fine. I thought a virus or spyware could be clogging the network, but local network traffic seems fine. I did find the NETSKY.Q virus one machine but it seems to be cleared off. I also made sure that the system restore was turned off of the infected machine while I cleaned the NETSKY.Q. I received an email from NAV on another machine that it caught an email trying to be sent with the NETSKY virus from that machine and it said it had quarantined it, but when I looked in Norton there was nothing there and my scans turned up nothing. I have scanned all systems on the network. I have even shut down my switch and scanned for viruses with a fully updated Norton Corp, and then when nothing was found I scanned with the switch off in Safe mode. PLEASE HELP!!!!!!!!!!!!!!!!!!

It's probably the worm doing DOS attacks on the sites listed here. Looks like people in your office haven't been educated not to open .ZIP or .PIF attachments on unsolicited email.

Can't argue there! I think it feels like a worm, I just can't find it.

Hi ... it looks like I am not alone. We have 20+ comp connected to LAN via a router modem. There is intermittent internet down problems. When internet is down, the LAN is still functioning. If we reset the router the net is up again, but after a while, it goes down again.... The ISP also tested the line and says the signal strength is good, and there is nothing else they can do for us.... So right now also not sure where the problem is. My PCs are all on Win 98. Is there any way to know for sure that the DOS attack mentioned above is the real cause ? And then how to remove the problem ? Appreciate help on this very much ... desperate .. :-(