All websites are down with the following error:
PLESK_INFO: This site can’t be reached
- The following can be found at domains’ log
436#0: *810 SSL_do_handshake() failed (SSL: error:140770FC:SSL routines:SSL23_GET_SERVER_HELLO:unknown protocol) while SSL handshaking to upstream
It is not possible to restart the nginx service:
# service nginx restart
Unable to start service: Unable to manage service by nginxmng: (‘start’, ‘nginx’). Error: ERR [util_exec] proc_close() failed [‘/usr/local/psa/admin/bin/nginx_control’ ‘–start’] with exit code  Error occured while sending feedback. HTTP code returned: 502 Error occured while sending feedback. HTTP code returned: 502 Can not start proxy server:
nginx: nginx: [emerg] bind() to 203.0.113.2:443 failed (98: Address already in use)
nginx: nginx: [emerg] bind() to 203.0.113.2:80 failed (98: Address already in use)
The nginx service was not stopped correctly.
Connect to the Plesk server via SSH.
Re-enable Plesk nginx proxy using these commands:
# /usr/local/psa/admin/bin/nginxmng -d
# /usr/local/psa/admin/bin/nginxmng -e