in you source, check GunZ/ZLocaor.h
you gunz.exe is fresh gunz using port locator -9500, because your server does not come out, it is because in the firewall you can not open ports with signs (* / + - "% ·") among others.
Download the source of Fresh and copy, the port is changed there is no other way to do it I have sure you use that src
If you want help, I can compile the src in vs 2015 and give it to you :'v