One way to prevent this from happening is using a different computer. Lots of stress can be put on the computer if it's running the server, and your game at the same time. This would be like running minecraft in three different windows.
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It means the server hasnt updated to a newer version of the game.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 :)
The game server may be overloaded or there could be block by adminstrator where you are playing.
Make sure the plugin isn't outdated, and check what your console says.
if its ur server than try restarting it but if its a friends server than wait a bit
It depends on the server. Some people ban you for a longer amount of time than others. Improved: When you try to join a server and it says "You have been temp-banned for (time)" You will be unbanned after that period of time. But if it says "You have been banned from this server." Your are banned for life.