Why is the network not working after restoring Windows Server 2012?

Question

Windows Server

Tell me please. After restoring Windows Server 2012 to the same hardware, using standard tools, archiving. The network connection stops working, it does not receive packets, only an unidentified network sends and writes. I just don’t understand, it’s also iron, the backup is just a month old.
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//UPDATE
Regular i5, h61 chipset. It's just that this was the task, it costs 2012 Traffic Inspector on it. All this is on the oldest HDD, and I wanted to transfer everything to the SSD. I didn’t want to use third-party transfer tools, and the idea was to roll an old backup a month ago onto an SSD and then go and swap them. Because nothing happened for a month. No updates, just logs from TI, that's all.
//UPDATE 09/10/15
The question was solved, in general the problem was solved after I registered the gateway in the network connection manually.

Answer 1

what kind of iron? look towards the drivers set. card, upstream switch, gateway. Maybe your domain name flopped, another ip was received that is not statically resolved on the network and / or something else. Need more information!

Answer 2

I seem to understand, turn off the server, boot from Live-CD, start Acronis b&r or echo server, make a backup, connect a new disk, restore it, everything will definitely work (if the disks have one interface)