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Desktop Certificate errors suddenly showing up

Posted on 2011-04-30
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Last Modified: 2012-05-11
A technician says that he's noticing his desktop showing up with the following errors

'Network Cable Unplugged. Windows was unable to find a certificate to log you onto the network'

What is this message, where is it coming from and how to we resolve the issue?

They been rebooting their PC's very frequently because of this message.
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Question by:bernardb
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11 Comments
 
LVL 10

Expert Comment

by:cbmm
ID: 35497111
Is this across the board or on one workstation?
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Author Comment

by:bernardb
ID: 35497119
He says he's seen it on several workstations
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LVL 81

Expert Comment

by:arnold
ID: 35497276
Do you have an Enterprise CA and autoenroll GPO, but your CA/Subordinated CA 's certificates may have expired and are no longer issuing certificates to the clients?

In short, you have a certificate based authentication setup to access/connect to the wireless network and that certificate is no longer valid.
Or do you have some other means by which the workstations "authenticate" to get a network connection? I.e. radius on the switch etc.?
http://answers.yahoo.com/question/index?qid=20071010175832AAcpP8o

Without knowing what your environment is like or is this a laptop/desktop?
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Author Comment

by:bernardb
ID: 35497308
These are desktops, directly connected to the network I'm told, not the wireless environment. The facility does have a wireless network also, but the technician says the messages are coming up on the desktops that are wired into the network, not the wireless laptops or devices.
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LVL 10

Expert Comment

by:cbmm
ID: 35497326
I would suggest to tell the technician to take a look at the event viewer and give us the error thats associated with this. Sounds like someone has turned on 802.1x possibly through gpo.
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LVL 10

Expert Comment

by:cbmm
ID: 35497331
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Author Comment

by:bernardb
ID: 35497483
Ok, let me get a little more information from him. Can you give me a few questions to ask him that will help with troubleshooting the issue?
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LVL 81

Expert Comment

by:arnold
ID: 35497532
get the output from gpresults /v.

Did they recently add a windows 2008 server DC? did they setup a Group Policy Preferences etc.

Is there a pattern for computers that have this issue? windows 7, are these systems in a particular OU, etc.

This will help you narrow down to then direct the user to use GPMC to get Group POlicy results  to see the settings, and/or check what GPOs apply to the OU and what those GPOs supposed to do. Hopefully they were named to describe what they do as opposed to policy1,policy2.
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Author Comment

by:bernardb
ID: 35694512
I'm so sorry, it must not be bothering them that bad or they aren't getting the error anymore. The technician is on vacation...I want to award points, but I guess I should wait. My apologies
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Accepted Solution

by:
bernardb earned 0 total points
ID: 35733826
I'm so sorry Experts, it's been hard getting in touch with the technician...He says the issue stopped. multiple issue were going on at the same time.

1st I updated all of the servers remotely at the location, Win2k3 SP1 to Win2k3 SP2 along with all applicable updates.

2nd the technician discovered a bad UPS that connected a switch that was for 2 floors. He replaced the batteries in the UPS.



3rd every switch, router and server was rebooted...

The problem hasn't reoccured....or at least he hasn't told me...
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Author Closing Comment

by:bernardb
ID: 35821854
The issue is resolved and the best reason I can see for the resolution of the problem was the updates...Didn't know how I'd give the points elsewhere.
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