Additional context We could create a specific Varnish helper plugin for O2Switch, since they're using only one IP, the array is not needed. The other solution is to fix this problem on the WP Rocket's ...
Open a terminal on o2switch Cpanel Type ssh-keygen set all to default with no password Then type ssh-copy-id -i .ssh/id_rsa.pub user_remoteserver@host_remoteserver.com this command autorize o2switch ...