All of my wordpress websites on cyberpanel suddenly shows error 503, Can anyone please help me.
Welcome @vishaljethwani Happy you are here
Are you using modsecurity ? Disable it and try again
Probably you reached max children process limit. You can confirm this by checking
/usr/local/lsws/logs/lsrestart.logto fix this just restart lsws service
$ systemctl restart lsws || service lsws reload
This means you might be having so many php processes running you will need to run High CPU Usage, 4CPU 8GB RAM - #19 by josephgodwinke
Makes sure to run upgrade script and reboot your server