Issue Bad Gateway on login page

[PhilFkk]

So, I just made the Upgrade avaliable on my Plesk Notifications and my panel page got into a blank page state, when I see the source code, it shows:
window.__INITIAL_DATA__ = {"code":"502","message":"Bad Gateway"}

I tried using this as I saw in some messages on the Forum:
systemctl status sw-cp-server

And got this result back:
Loaded: loaded (/lib/systemd/system/sw-cp-server.service; enabled)
Drop-In: /lib/systemd/system/sw-cp-server.service.d
└─respawn.conf
Active: activating (auto-restart) (Result: exit-code) since Mon 2020-03-09 20:26:35 UTC; 1s ago
Process: 4158 ExecStart=/usr/sbin/sw-cp-serverd -c /etc/sw-cp-server/config (code=exited, status=1/FAILURE)
Process: 4153 ExecStartPre=/usr/sbin/sw-cp-serverd -q -t (code=exited, status=0/SUCCESS)
Main PID: 24638 (code=exited, status=0/SUCCESS)

I already used the Repairs to try to fix it, but no luck so far

My link: https://147.135.77.7:8443/login.php

 

[IgorG]

My link: https://147.135.77.7:8443/login.php

I see correct Plesk login page here. What is wrong?

 

[Bitpalast]

Active: activating (auto-restart) (Result: exit-code) since Mon 2020-03-09 20:26:35 UTC; 1s ago

Maybe the post was created before the service completed restarting.

 

[PhilFkk]

Sorry the delay, I actually got to fix it before the post was approved.
Just tried everything I could find online until I fixed it lol
Uninstalled and installed a bunch of stuff, but my server was under attack at the same time, which made the task harder