need help! again...T_T

well everytime i open DGMS this pops out :


We are unable to connect to login server due to a server check,
a firewall block or other network issues.
Please check the Maplestory homepage for ongoing server checks
as well as your firewall settings


and so i check the rydah server homepage its online but i cant connet for some reasons
any suggestions ?????


also i tried another private server and it worked??
so wat now???

You either;
1. Did not set the game up properly.
2. Have firewall blocking the game.
3. The game was not on-line when you tried.

These may be incorrect but if you'll never know if you don't try.