You can safely ignore it if you are sync and mining, it's just that peer did not open port in his router.
Just remove  --log-level=4 string and it will not show all this stuff.


If you want to help network forward port in your router.

Forward P2P Port: 32347 for karbowanecd.exe on your machine.
Howto can be found here: http://www.howtogeek.com/66214/how-to-forward-ports-on-your-router/