Websites are unavailable in Plesk: 502 Bad Gateway - SSL: error:

[mahesh]

Question
Websites are unavailable in Plesk: 502 Bad Gateway - SSL: error:1408F10B:SSL routines:ssl3_get_record:wrong version number
Symptoms

• All domains are unaccessible with the error:

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502 Bad Gateway


• The following error can be found at domain's nginx error log

/var/www/vhosts/<domain_name>/logs/proxy_error_log:

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[error] 3755#0: *2278 SSL_do_handshake() failed (SSL: error:1408F10B:SSL routines:ssl3_get_record:wrong version number) while SSL handshaking to upstream, client: 203.0.113.4, server: www.example.com, request: "GET / HTTP/2.0", upstream: "https://203.0.113.2:7081/", host: "www.example.com"

• Nginx, Apache, MySQL services are up and running.

• Plesk nginxmng utility shows that nginx is Disabled:

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#plesk sbin nginxmng -s
Disabled

Cause
Unclear

Resolution
1.Connect to the server via SSH

2.Enable Nginx by running the following Plesk command:

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#plesk sbin nginxmng -e