Are you sure that your firewall isn't blocking FeralHeart? Sometimes that will keep you from connecting.
Sure thing ^^ Here's a quote from the guide.
Is the computer allowing FeralHeart to connect to the internet?
Games like these needs to be able to connect to the internet, but sometimes windows doesn't know if the game/application can be trusted or it just skips adding the game to exceptions. If you aren't able to log on the game, this might be your issue.
Open up your control panel located in the start menu. Depending on which Operating system you use, and which layout it might look differently. But Windows firewall should be in the category "security" or just find the text "Windows firewall" or "Allow a program through windows firewall". This should take you to the correct place.
Once there you'll get a new window with a list of programs. Try to locate FeralHeart.exe in there and add it to exceptions by marking the checkbox. If you can't find it, and the game to the list by yourself by pressing add program.
If you don't understand how to do this still, ask someone else to do this for you.