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Modern Mozilla cipher suite results in 502 on all websites on Plesk server

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Vladimir Chernikov
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kb: fixed kb: bug ext: sslit

Symptoms

  • All websites are not accessible with 502 Bad gateway

  • At Tools & Settings > TLS versions and ciphers management > TLS versions and ciphers by Mozilla the modern ciphers are set:
    modern.JPG

Cause

Product issue:

  • #PPPM-13038 "Websites running on nginx + Apache can now work correctly over TLS 1.3."
    Fixed in:

Resolution

Please consider updating your server:

Workaround

If update is not possible for some reason you may try the following

workaround

As a workaround:

  1. Log in to Plesk
  2. Go to Tools & Settings > TLS versions and ciphers management > TLS versions and ciphers by Mozilla
  3. Switch cipher suite to Intermediate:
    suite.JPG
  4. Click Change & Sync button to apply changes

 

Add TLSv1.3 into proxy_ssl_protocols in /etc/nginx/conf.d/ssl.conf

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