This is a quirky problem and it's driving me CRAZY....must
relax....must relax...must relax
OK I have a CAT5 wired network using a router with three computers and
one dedicated xbox wireless server attached. Literally years have gone
by and no problems. Yesterday, out of the blue, two of three computers
have lost network connectivity. The third computer and the xbox server
are fine. The computers are all running XP home. Let's call the two
"bad" computers a and b and the "good computer" c and the xbox d.
Computer a uses eTrust and has network on the mainboard. Computer b has
Norton and uses a PCI NIC card. Computer c is a laptop, and uses
Norton.
The first thing I did was shut off the firewalls. Then I ran the virus
scanners. I then installed a network card in computer a. I then ran the
network wizard again on both a and b. No joy. Then I took all four of
the cables out of the router, and plugged computer c's cable into each
connection on the router and computer c can access the internet on any
of the four connections. Then I took the CAT5 cable from the xbox
server which I know is good and connected it to computer b's NIC card.
Nothing.
So I think I've eliminated PC hardware, the router, the cable, the
firewall, and a virus. What am I missing?

Posting the result of ipconfig /all may help.

Bob Lin, MS-MVP, MCSE & CNE
Networking, Internet, Routing, VPN Troubleshooting on http://www.ChicagoTech.net
How to Setup Windows, Network, VPN & Remote Access on http://www.HowToNetworking.com
  This is a quirky problem and it's driving me CRAZY....must
  relax....must relax...must relax
  OK I have a CAT5 wired network using a router with three computers and
  one dedicated xbox wireless server attached. Literally years have gone
  by and no problems. Yesterday, out of the blue, two of three computers
  have lost network connectivity. The third computer and the xbox server
  are fine. The computers are all running XP home. Let's call the two
  "bad" computers a and b and the "good computer" c and the xbox d.
  Computer a uses eTrust and has network on the mainboard. Computer b has
  Norton and uses a PCI NIC card. Computer c is a laptop, and uses
  Norton.
  The first thing I did was shut off the firewalls. Then I ran the virus
  scanners. I then installed a network card in computer a. I then ran the
  network wizard again on both a and b. No joy. Then I took all four of
  the cables out of the router, and plugged computer c's cable into each
  connection on the router and computer c can access the internet on any
  of the four connections. Then I took the CAT5 cable from the xbox
  server which I know is good and connected it to computer b's NIC card.
  Nothing.
  So I think I've eliminated PC hardware, the router, the cable, the
  firewall, and a virus. What am I missing?

Computer b now is normal, don't ask me why. Computer a which is the one that
I first noticed was offline is still bad. When I type in file/run  ipconfig
/ all, the window comes up with the info and then shuts down right away. Is
there a switch or a print command that I can use to get the info?

Open command prompt by going to Run, type cmd.

Bob Lin, MS-MVP, MCSE & CNE
Networking, Internet, Routing, VPN Troubleshooting on http://www.ChicagoTech.net
How to Setup Windows, Network, VPN & Remote Access on http://www.HowToNetworking.com
  Computer b now is normal, don't ask me why. Computer a which is the one that
  I first noticed was offline is still bad. When I type in file/run  ipconfig
  / all, the window comes up with the info and then shuts down right away. Is
  there a switch or a print command that I can use to get the info?

Hi
First check the Router to make sure that the setting are correct as far as
DHCP and that No Computer (IP) is filtered out.
In General, you can debug the Network Settings of a computer by following
these steps.
Step One. Check the Network parameters in the Computer's Device Manager.
Make sure that the Network Card drivers are installed correctly; i.e. there
is No IRQ conflict, and No Ghost installation.
http://www.ezlan.net/faq#ghost
Step Two. Verify Basic network setting in the OS:
http://www.ezlan.net/Installing#verify.
If the above two Steps indicates that every thing looks good but
functionally it does not work.
Step Three. Check (and repair if necessary) the Socket Layers, Winsock, and
or refresh the TCP/IP Stack. http://www.ezlan.net/clean#refreshnet
Jack (MVP-Networking).

<m_corbe***@juno.com> wrote in message
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