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How to fix Server 2012 with unidentified network.

Posted on 2015-01-22
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Last Modified: 2015-01-27
Installed a fresh copy of Server 2012. It got DHCP from the firewall and came up. I installed all the updates. Then I renamed the server and changed the IP from DHCP to static. Plugged it into the network and it says unidentified network. I uninstalled and reinstalled the NIC and nothing. I cut on network discovery and nothing. Changed IP's again and nothing.
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Question by:aando
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by:Aaron
Aaron earned 200 total points
ID: 40564682
If you plug a laptop into the same port does it have any issues like this?
Might want to check your Gateway, DNS and subment mask...
Can you ping anything else on the network(DNS or other PCs or printers)?
Is this a new network or are you just adding more? I was thinking you might want to remove and add to domain again after that name change if it is an established domain... Sometimes name change you can loose the trust relationship.
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aando earned 0 total points
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Its on a workgroup. It can't talk to anything. Network says Public/Network unidentified. Can't ping the gateway or anything. No traffic is being routed.
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by:aando
ID: 40565014
I plugged it into another Domain, cut on DHCP and it started working. Put it back on static and moved it to the other network and it changed again but still working.

Thanks,
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Expert Comment

by:Aaron
ID: 40565017
And did you try the same cable with another PC or laptop? Just to make sure that isn't where the issue is? I had a NIC go the other day and it was still giving blinking lights but showed uniedntified network. Do you have another card or maybe like a USB adapter you could temporarily use(usb to ethernet "RJ45" or even USB to wifi just to test it).

Have you tried in command prompt -
ipconfig /release
ipconfig /flushdns
ipconfig /renew
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by:Aaron
ID: 40565019
Okay great, ha ha always crazy how these things act sometimes. Setup 100 PCs the same and get 1 that has a random issue.
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by:Aaron
ID: 40565045
So removing and adding to domain/workgroup worked along with changing the dns/subnet mask/IP/gateway (you chose to do this by adding back to dhcp then back to static) did work? Or that it was indeed the trust issue?

Why close the question if I answered it?
-Not objecting just curious (I have only been on experts a few months)
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Author Closing Comment

by:aando
ID: 40572363
Apparently it did lose trust but moving to a couple different networks and back fixed it.
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