503 Service Unavailable Error

 today i find that all the websites are not functioning, showing the error "Service Unavailable ."

The server is temporarily unable to service your request due to maintenance downtime or capacity problems. Please try again later.
 I hope you can provide a solution.

Did you try a full server reboot? 50x series errors indicate capacity problems (bandwidth, disk space, cpu-bound timeouts).

You've successfully resolved the previous issue by renewing the CWP Pro panel license. However, a new problem has emerged: Apache has stopped working.
● httpd.service - Web server Apache
   Loaded: loaded (/usr/lib/systemd/system/httpd.service; enabled; vendor preset: disabled)
   Active: failed (Result: exit-code) since Tue 2023-11-07 10:12:22 CET; 4min 53s ago
  Process: 7704 ExecStart=/usr/local/apache/bin/apachectl start (code=exited, status=1/FAILURE)

Job for httpd.service failed because the control process exited with error code. See "systemctl status httpd.service" and "journalctl -xe" for details.