Server is online but can't connect still

Hi, my server is online and i can't get into it with my friend, can someone help ?

io.netty.channel.AbstractChannel$AnnotatedConnectException: Connection timed out: no further information:

Edit : just after closing the error message it works

I GOT NO CLUE WHAT HAPPENED

Quote from AlexanderSniper1

Ok, but do you use TLauncher btw?

no. i'm on premium.

Quote from Roman

Try using the DynIP: Connect

can i ask another question ?

i was not able to type commands but for some reasons i restarted the server and it worked !