Unable to open files from /var/www/vhosts/example.com/httpdocs/.well-known/pki-validation: 404 Not Found

Symptoms

• Unable to open files from /var/www/vhosts/example.com/httpdocs/.well-known/pki-validation/ directory with the error:

  404 Not Found

• The following error can be found in the /var/www/vhosts/example.com/logs/proxy_error_log file:

  open() "/var/www/vhosts/default/htdocs/.well-known/pki-validation/test.txt" failed (2: No such file or directory)

• Common Challenge Directory feature is enabled on the server:

  # plesk ext sslit --common-challenge-dir -info
  - Available: true
  - Enabled: true

Cause

Missed directory /var/www/vhosts/default/htdocs/.well-known/pki-validation/. 

Resolution

1. Log into the server via SSH.
2. Create missed directory /var/www/vhosts/default/htdocs/.well-known/pki-validation/:

   # mkdir -p /var/www/vhosts/default/htdocs/.well-known/pki-validation/

3. Move file /var/www/vhosts/example.com/httpdocs/.well-known/pki-validation/test.txt to /var/www/vhosts/default/htdocs/.well-known/pki-validation/:

   # cp -pr /var/www/vhosts/example.com/httpdocs/.well-known/pki-validation/test.txt /var/www/vhosts/default/htdocs/.well-known/pki-validation/