1 computer on network won't connect to router

[Guest]

I recently replaced my router and now one of my computers is not able to
connect to the router/internet. I have a WAP and two computers hardwired to
the router and everything works fine except for one of the hardwired
computers. I removed the cat 5 cable that connects the problem computer to
the router and I connected that directly to the dsl modem and it worked fine
so the cable seems to be function properly. As soon as I removed it from the
modem and put it back on the router it stopped working. Since the router is a
good distance from the problem computer I moved the computer closer to the
router and connected it directly to the router with a different cable and it
worked fine. Any thoughts? I am not very familiar with cat 5 cables and how
they should be wired, but it almost appears that this new router is not
working with the wiring that I was using with the old router.

 

[Robert L [MVP - Networking]]

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
I recently replaced my router and now one of my computers is not able to
connect to the router/internet. I have a WAP and two computers hardwired to
the router and everything works fine except for one of the hardwired
computers. I removed the cat 5 cable that connects the problem computer to
the router and I connected that directly to the dsl modem and it worked fine
so the cable seems to be function properly. As soon as I removed it from the
modem and put it back on the router it stopped working. Since the router is a
good distance from the problem computer I moved the computer closer to the
router and connected it directly to the router with a different cable and it
worked fine. Any thoughts? I am not very familiar with cat 5 cables and how
they should be wired, but it almost appears that this new router is not
working with the wiring that I was using with the old router.

 

[Chuck]

I recently replaced my router and now one of my computers is not able to
connect to the router/internet. I have a WAP and two computers hardwired to
the router and everything works fine except for one of the hardwired
computers. I removed the cat 5 cable that connects the problem computer to
the router and I connected that directly to the dsl modem and it worked fine
so the cable seems to be function properly. As soon as I removed it from the
modem and put it back on the router it stopped working. Since the router is a
good distance from the problem computer I moved the computer closer to the
router and connected it directly to the router with a different cable and it
worked fine. Any thoughts? I am not very familiar with cat 5 cables and how
they should be wired, but it almost appears that this new router is not
working with the wiring that I was using with the old router.

Jim,

It's not unknown for Ethernet cables to stop working, when you remove them from
one device and connect to a second. If you find that the problem is the cable,
just buy a new cable. You can always keep the old cable for an application
where it's not so finicky.

 

[Guest]

Chuck,
At first I thought it was the cable, but it seems to work just fine when
connected directly to the modem. The reason I can't just replace my cable is
that my modem/router are about 75' away from my computer and the cable was
professionally installed within the walls/floor. I was hoping it was just a
matter of rewiring a jack.
JT

 

[Guest]

Robert,
I don't have the details in front of me at the moment, but I believe the
reponse to ipconfig/all was "media disconnected".
JT

 

[Chuck]

Chuck,
At first I thought it was the cable, but it seems to work just fine when
connected directly to the modem. The reason I can't just replace my cable is
that my modem/router are about 75' away from my computer and the cable was
professionally installed within the walls/floor. I was hoping it was just a
matter of rewiring a jack.
JT

It could be a wiring issue. Finding the problem, if that's it, is going to be
interesting. I'm not a fan of do-it-yourself Ethernet cabling, though I have
done it. I installed an 8 computer LAN at my church, with cables placed by an
electrician, and us doing the rest. How easily can you get the professional
installers to retest the cable?

 

[Guest]

It's not too hard to get them to come back and take a look at it. I am just
trying to confirm that it is in fact a wiring issue. Some feedback I have
been receiving elsewehere is that my new router does not have auto sensing
ports and the cable that I have might be configured as a crossover cable or a
patch cable when in fact it should be the other one of these configurations
to work properly with the new router. I don't know how to spot the
differences between these two types of configurations, are you familiar with
what I should be looking for to spot the differences?
Thanks,
JT

 

[Guest]

If you can move a different computer to that spot to test the conection. If
a good connection is established than you probably have a NIC card problem.
If not, the RJ45 jack is the probable cause. to check the jack unscrew the
face plate from the wall. Depending on the type of installation you may be
able to see the conectors at this point. If not continue gently (the wiring
and jack will not break if you just touch it, but it doesn't like being
yanked on either) remove the jack from the face plate. when you can see the
wiring conections, 4 on either side of the jack ensure that all wires are
firmly conected to a slot. The wiring color codes for A and B are on the
jack. If a wire is lose it needs to be repunched down. a very thin flat head
screw driver can be used if you don't have a punch.

 

[Guest]

Thanks William. I just hooked up a different computer to this cable and I
recieved the same response as the original computer. I will take a look at
that wiring and see what I can determine.
JT

 

[Robert L [MVP - Networking]]

This troubleshooting may help,

ipconfig errors Media disconnected 1/3. Symptoms: when using ipconfig to check the IP configuration, ... Media disconnected. Cause: 1. Bad NIC. 2. Bad connection. ...
www.chicagotech.net/tcpipissues/mediadisconnected.htm


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
Robert,
I don't have the details in front of me at the moment, but I believe the
reponse to ipconfig/all was "media disconnected".
JT

 

[Chuck]

It's not too hard to get them to come back and take a look at it. I am just
trying to confirm that it is in fact a wiring issue. Some feedback I have
been receiving elsewehere is that my new router does not have auto sensing
ports and the cable that I have might be configured as a crossover cable or a
patch cable when in fact it should be the other one of these configurations
to work properly with the new router. I don't know how to spot the
differences between these two types of configurations, are you familiar with
what I should be looking for to spot the differences?
Thanks,
JT

Jim,

If the issue is crossover vs patch cable, just get a crossover cable, and a
connector. Connect a crossover cable to the suspect cable, and see if it works
that way. You should keep a crossover cable on hand anyway.
<http://nitecruzr.blogspot.com/2006/08/what-is-crossover-cable-and-why-do-i.html>
http://nitecruzr.blogspot.com/2006/08/what-is-crossover-cable-and-why-do-i.html

 

[Yves Leclerc]

The problem is the cable. When you connect the cable directly to DSL modem it
works. Most DSL modems only connect at 10-Base-T speed (under 10) and most
router LAN ports are 10 / 100-Base-T (or even 1000-Base-TX.) This indicate
that the cable is "borderline" acceptable. If you change the network adapter
card connection speed (NIC properties) and force it to only use 10-Base-T /
half-duplex, you should find the message gone.