Is the server up? or is the owner asleep or somewere.
cause the server may be down.
That is probably because you do not have any other people on the server. To let other people onto a server you need to give them your server ip.
Twitter about it... that's what i do!
You do not have a flash player
it is :25565 dont forget the : because it wont let you join with out it.
You need to wait for their server to be updated to 1.3 too.
server down
Too much memory?
Check your settings and make sure that it says Multiplayer==>ON.
You need to have the installation of the program of the private server. Check out the website of the private maple story server what is the requirement and installation needed to play
Does it to me too sometimes it wont even let me onto it or buy things or change my outfit!
either you don't have An internet connection or you have a cracked account on minecraft and it wont let you on. The alternative to this is their minecraft server was having issues.