it means the server has gone down such as minecraft server has crashed or the server owner has lost Internet connection
Wen says bad request the server isn't offline, you can change it in server.properties.
I can't find where it says server is visible
It means the server hasnt updated to a newer version of the game.
Maybe the server is temporarily not available or you are using anjocaido's minecraft launcher. If you have that you need to download Hamachi and Type Server iD IP Password and Gate
wrong bukkit version.
someone let me know please
First, You go to minecraft.net and then click the link that says download. Scroll down to the section that says Multiplayer. click on the link that says Minecraft Server.exe Download and enjoy with your friends :)
Make sure the plugin isn't outdated, and check what your console says.
The game server may be overloaded or there could be block by adminstrator where you are playing.
if its ur server than try restarting it but if its a friends server than wait a bit
Do what the wedsite says, then look up a youtube video, which will tell you what to furthermore do.