Cannot Connect to a server

Hello I am trying to connect to the Florida Wasteland server here it is http://toprustservers.com/server/6234 yet it never shows up on the server list, it under modded or should be, or under my friends tab even though i have 3 friends who actively play on this server, sometimes when im trying to connect so i know the server is up and working. I can play on any of the servers that do show up. I’ve tried connecting through the console commands using the ip but it says connection failed. If anyone knows how to fix this feel free to tell me.