You can try to disable and enable your nic but I highly doubt that will solve your problem. Your power went out from what I can determine and your server is up on ups. Are your switches and hubs also on UPS? If the server is up but the backbone or infrastructure is down – you are not going to get anywhere.
But I digress… Yes you can try disabling/enabling your nic without causing more problems.
Gilly400 gave the correct answer below, he said:
Option 1 – Work with TCP/IP interfaces
Option 10 – End – to end a specific interface
Option 9 – Start – to start a specific interface
<b>It probably goes without saying…but we’ve all been up 24 hours before and been tired, so I’ll say it anyway… Make sure to not do this from a telnet connection to the interface you are connecting to or you will lose your connection after doing option 10 and not be able to connect again until you run option 9 from the console.</b>