Server is online, but i see it "offline"

Hello!

I have a little problem with aternos server.

My friend created server on aternos, but when i added this server to server list in minecraft, appeared "server is offline"

But my friend is on this server.

I have checked everything! I tried to direct connect, remove and and server to server list, was trying use another launchers, but these things doesnt work.

I have written server IP 100% correctly, and i use correct minecraft version.

For my friends server works, but for me is offline, i do not know why!

Can anyone help me?

I will add that, i see ALL off aternos server offline, despite the servers are online.

IP IS CORRECT MY FRIENDS ARE ON THE SERVER, BUT I CANT CONNECT BEACUSE IT APPEARS FOR ME "OFFLINE" I DONT WANT WHY

PLEASE HELP I WANT TO PLAY WITH FRIENDS