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Yellow Bang on Ethernet Connection Icon

Posted on 2011-10-19
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Last Modified: 2012-05-12
-After a power outage, two of our PC's, one Windows XP and one Windows 7 will not browse the local network and no Internet connection.
-Both are displaying the Yellow Bang on the ethernet connection taskbar icon.
-Both DO aquire IP addresses from our DHCP server.
-Both DO register in our DNS server.
-Neither machine will ping any other address on the local network.
-Both are on a domain.
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Question by:Lance McGrew
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Expert Comment

by:jawa29
ID: 36991820
Hi

Do they both have the correct Default Gateway?

Jawa29
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Author Comment

by:Lance McGrew
ID: 36991922
Yes.  As mentioned they are getting DHCP information.
Doing ipconfig /all displays all the regular stuff I am used to seeing.
192.168.1.xxx
255.255.255.0 mask
192.168.1.2 gateway
192.168.1.11 dns
I can do an ipconfig /flushdns, ipconfig /release, ipconfig /renew with each command completing successfully.
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Expert Comment

by:jawa29
ID: 36992166
Just because they are getting DHCP information doesn't mean it's right, I've seen PC's running DHCP leases that have default gateways of 0.0.0.0

I assume you've tried obvious things like replacing the cables, changing switch port/switch?

Jawa29
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Author Comment

by:Lance McGrew
ID: 36992193
-Yes - tried connecting to totally different ethernet cable.
-Tried hooking into different switch ports in server room. (all connections display link lights)
-Tried static IP address assignment.

Could any of this relate to Group Policy security issues?
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Author Comment

by:Lance McGrew
ID: 36992204
Also we are NOT running OS firewall on these machines.  
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Expert Comment

by:jawa29
ID: 36992222
It could be GPO, try running a GPO results report against one of the clients.

Also disable the firewall on the client

Jawa29
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Author Comment

by:Lance McGrew
ID: 36993088
- As mentioned - firewall is already disabled.
- gpresult is inconclusive because of network connection.
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Expert Comment

by:jawa29
ID: 36993356
As a precaution I would uninstall the network card drivers and re-install, this will rule out a driver issue.

Jawa29
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Author Comment

by:Lance McGrew
ID: 36993554
Already tried uninstall reinstall drivers for NIC.
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Accepted Solution

by:
Lance McGrew earned 0 total points
ID: 36993562
- Temporary solution was to disable onboard NIC.
- Install auxiliary NIC.

System back up now.
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Author Closing Comment

by:Lance McGrew
ID: 37016578
Original problem remains unsolved.  A work-around solution was completed by me.
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Expert Comment

by:jawa29
ID: 36993575
Excellent glad you found a solution.

Jawa29
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Expert Comment

by:aleghart
ID: 36994900
NICs do die.  Sometimes it's caused by an event, sometimes just dead from age/component failure.  Since this is on-board, no way to swap it out for a known-good unit, so your solution of replacing it is the way to go.

If the motherboard is under warranty, you could pursue it with the manufacturer or seller.
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