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Extension can not be installed on Plesk server

Vladimir Levchuk
Updated
Plesk Obsidian for Linux

Applicable to:

  • Plesk Obsidian for Linux 

Symptoms

  • Installation of a Plesk extension fails due to the following error:

    The extension sslit is not allowed for installation.

  • Instead of the extension details, the following information is shown on the extension page (Extension catalog):

    Version undefined-undefined

  • Attempting to install extension manually via CLI fails with the error:

    # plesk bin extension -i <extension_name>
    '<extension_name>' neither a valid package name or a path

  • The extension is not blacklisted on the server in panel.ini
  • The extension can be found blacklisted in /usr/local/psa/admin/conf/customizations.conf file (which is uploaded automatically from Product configuration page of the license)

Cause

Product Configuration bound to the Plesk license has the extension blacklisted.

Resolution

Contact an account manager to exclude the extension from the blacklist for the Plesk license in Partner Central.

If the extension isn't blacklisted or was recently removed from the blacklist, follow the steps below:

Via Plesk interface
  1. Log in to Plesk.
  2. Go to Tools & Settings > License Management
  3. Click Retrieve Keys to re-retrieve the license keys.

 

Via CLI
  1. Connect to a Plesk server via SSH

  2. Execute one the following commands to retrieve the license keys:

    # plesk bin license --retrieve

    # /usr/local/psa/bin/server_pref --load-customizations

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