Plesk does not open: SWKeyExFatalError Repository is not opened

Symptoms

• The following error message is shown on attempts to log in to the Plesk UI or browsing its pages:

  Type SWKeyExFatalError
  Message Repository is not opened
  File functions.php

• One of the following error messages appear in /var/log/plesk/panel.log:

  ERR [panel] Unable to get key: Repository is not opened

  ---

  Could not open Repository at "/etc/sw/keys": Empty repository file: /etc/sw/keys/registry.xml:

  ---

  [2019-07-04 16:36:07.684] ERR [panel] Repository is not opened:
  0: /usr/local/psa/admin/plib/functions.php:3343
  of_get_key_by_product(string 'plesk-unified')
  1: /usr/local/psa/admin/plib/functions.php:3343
  getPleskKey()
  2: /usr/local/psa/admin/htdocs/server/key_info.php:29

• Following the article, plesk repair fs -system command fails as below:

  # plesk repair fs -system -y
  ...
  Checking Linux system files
  There are incorrect permissions on some items:
  /etc/sw/keys/registry.xml ......................................... [ERROR]
  - The file /etc/sw/keys/registry.xml was not found.
  Repairing incorrect permissions ................................. [2019-07-04 16:30:08.869] ERR [util_exec] proc_close() failed ['/usr/local/psa/admin/bin/fsmng' '--set-ac' '/etc/sw/keys/registry.xml'] with exit code [1]
  [FAILED]
  - fsmng failed: ERROR:[Errno 2] No such file or directory:
  '/etc/sw/keys/registry.xml'
  Error messages: 1; Warnings: 0; Errors resolved: 0

• The /etc/sw/keys/info file is empty:

  # cat /etc/sw/keys/info
  # (empty output)

Cause

Empty /etc/sw/keys/info file.

Resolution

1. Connect to a Plesk server via SSH

2. Edit /etc/sw/keys/info file and the following content:

   sw-key-repository-1.0

3. Apply the solution from the article