What are the nodes that it wallet should be connecting to?
Try 104.236.195.137
Still no connection with the new wallet, even with this node.
What wallet version are you using?
you can check this by issuing 'getinfo' command:
"version" : "v2.0.0.0",
"protocolversion" : 89000,
"walletversion" : 60000,
if this is fine you can also try another node: addnode=194.181.3.79
Yes, getinfo gives the same information as yours.
The command addnode IP add doesn't work in the debug console. How to name the config file, noblcoinpos like the folder it created?
"noblecoin.conf" is config file name
Yes, you need to provide '-addnode' during startup so if you are under windows you can create shortcut to your wallet and modify it to include '-addnode=...'
Ok, found the mistake. It created a folder NobleCoinPOS in Appdata/Roaming. I created a conf file and names it Noblcoin.conf but that caused an error message. So I tried it with the config file's name NoblecoinPos.
I deleted the old wallet's folder and the newly created one, started the wallet and created noblecoin.conf. Now I'm connected. Thanks!!
No worries. Good luck with mining

What probably happened is this: at time of first connection your client does not know any IP addresses. It uses IRC to find other peers. However sometimes connection to IRC is delayed. After it finishes connection to IRC it learns and stores IP addresses of other peers. So next time you start your wallet it will use this information.