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Knowledge Base

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

 
apachedomainshttphttpsmysql

Symptoms

  • All domains are unaccessible with the error:

    502 Bad Gateway

  • The following error can be found at domain's nginx error log /var/www/vhosts/<domain_name>/logs/proxy_error_log:

    [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:

    # plesk sbin nginxmng -s
    Disabled

Cause

Unclear

Resolution

  1. Connect to the server via SSH

  2. Enable Nginx by running the following Plesk command:

    # plesk sbin nginxmng -e

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