Issue plesk does Server down?

[Sprayy]

Server operating system version

Ubuntu 22.04

Plesk version and microupdate number

18.0.54

Hello together,
im kinda new into ubuntu and Servers. 4 Months ago i got my first one and everything seemed perfect, but today for some reason i couldnt get to the Server UI (login-page) and all my sites are down. Pinging the Server and the websites seems to be working fine. I tried restarting the server multiple times (soft and hard), but it dindnt help.
I didnt change anything, the server just stopped working (it worked in the morning, didnt work when i came back home 7 hours later).
Any help would be appreciated, thanks.

 

[WebHostingAce]

What is the actual error when you are trying to login to the server?

 

[Sprayy]

I cant even establish a connection to the URL / IP

 

[Peter Debik]

Do you find your own access point IP (or the first three octets of it) in /var/log/fail2ban.log?