Ethernet cable not detected

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Narcissss

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Jun 19, 2014
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Hi
My NIC (Asus P8Z77-V LX; Realtek PCIe GBE Family Controller) does not recognize my ethernet cable. It's a home made cat 6 cable tested with a professional cable tester. Works with my laptop flawlessly. And it's connected directly to a modem.
The strange thing is, sometimes it just miraculously starts working. Like when I reseted the CMOS and again another time out of the blue when I was looking for a solution on my laptop. Then I rebooted the PC and it went dead again. (On both occasions.)
The drivers are properly installed as the NIC is shown under network adapters in device manager.

What I've tried so far:
- switching the ports on my modem (to both 100 Mbps and 1 Gbps)
-ping 127.0.0.1 (came out fine)
-trying the cable on my laptop (works)
-completely reinsatalled the drivers (along with trying to disable/enable it.. etc)
-all the options under speed&duplex in advanced tab
-disabling and reenabling the NIC in BIOS
-completely reseting CMOS (NIC worked for one boot - I suspect randomly?)

I'm highly sceptical about it being a hardware problem since it works on occasions. On the other hand, I have no idea what software problem could be causing that. But ok, I don't really know much about networking aside from the basics.

Any clues, anyone?
 
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kanewolf

kanewolf

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May 29, 2013
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Is this a newly built computer? Is it possible that the port shield is interfering with the ehternet port? Many times the port shield around the ethernet port has metal fingers that are supposed to touch the outside of the shield on the RJ45. If any of those is not where it is supposed to be you might have a problem.
 
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N

Narcissss

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Jun 19, 2014
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Well in fact.. it is. Forgot to mention that. Now huh, what exactly is a port shield? The metal sheet you get with your motherboard that has 'holes' for all the ports cut out and is placed at the back od the computer? Because this is the only thing that has metal fingers and I discovered they actually don't touch the ethernet port on the motherboard.
In case that's not what you meant, there are also metal fingers (just found out) on the inside of the eth. port and they indeed are supposed to touch the shield on the RJ45.
Anyway, I checked and fixed them so now they are all in contact with the shield (the metal sheet/eth. port on mobo and inside of eth. port/RJ45), but it still doesn't work.

Thanks for your reply, though :)

Edit: Is the shield of the cable supposed to be touching the shield on the RJ45? If yes, what if I don't have a shielded RJ45? (I do, but I'm curious :)) +Forgot to mention earlier, the LEDs on the back of the eth. port are constantly yellow (left) and orange (right). No changes or blinking whatsoever.
 
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kanewolf

kanewolf

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May 29, 2013
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I was talking about the metal sheet that comes with the motherboard. I had an instance where there WERE metal fingers that were supposed to touch the top of the RJ45 port, but got bent so that they were interfering with the port.

Even though you did due diligence with the cable, have you tried a factory made cable?
 
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