Website hosted in Plesk shows error 502 in the browser: AH01071:

[mahesh]

Question
Website hosted in Plesk shows error 502 in the browser: AH01071: Got error 'Primary script unknown'
Symptoms

• Website displays the error 502 Bad Gateway.

• Under domain logs /var/www/vhosts/example.com/logs the following error can be found:

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[proxy_fcgi:error] [pid 17521:tid 140525340448512] [client 35.181.112.20:0] AH01071: Got error 'Primary script unknown'

• Plesk utility plesk repair fs returns domain incorrect ownership.

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#There is incorrect ownership on some items in the WWW root directory
of the domain 'example.com' ............................................ [ERROR]
Cause
Incorrect domain file permissions.

Resolution
1. Connect into the server via SSH

2. Fix the domain permissions with the following Plesk utility:

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#plesk repair fs example.com -y
If issue is present on several domains, execute the following command instead:

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#plesk repair fs -y