The license key is intended only for use with Plesk operating inside the following virtual environments

Symptoms

The following error is shown when attempting to open Plesk interface or update a license key:

PLESK_ERROR: Error: The license key is invalid. In order to use Plesk, you need to obtain and install a new valid license key.The license key is intended only for use with Plesk operating inside the following virtual environments: Virtuozzo containers, VMWare, Microsoft Hyper-V, Xen, KVM, Virtuozzo Server, LXC, Docker.

Cause

There are several possible causes:

• Plesk is installed on a not supported virtualization environment;
• Hacked BIOS on the physical machine;
• A misconfigured virtual machine is detected as physical host;
• Increased limits on a container.

Resolution

Plesk supports only the following virtualization solutions:

• VMware
• XEN
• Virtuozzo (former Parallels Cloud Server 6)
• OpenVZ
• Virtuozzo containers 4.6 for Linux
• Virtuozzo containers 4.6 for Windows
• Virtuozzo containers 4.7 for Linux
• LXC (Docker)
• KVM
• Hyper-V

If virtualization environment is not supported, upload dedicated Plesk license, not a VPS one.

To see how Plesk detects the environment it runs in, use either of the following methods:

• For Plesk 12.0 and later:

  1. Use the following script, both Linux and Windows. Create a file with the following code (named as info.php):

     CONFIG_TEXT: <?php
     require_once('api-common/cu.php');
     cu::initCLI();
     $cu = new cu();
     try {
     $si = var_export(getServerInfo(), true);
     cu::print_stdout($si);
     
     } catch(Exception $e) {
     cu::print_stderr("Error: " . $e->getMessage());
     cu::cuExit(1);
     }
     
     cu::cuExit(0);

  2. Then execute it:

     • Windows:

       C:\>"%plesk_bin%\php.exe" info.php | findstr platform

     • Linux:

       # /usr/local/psa/bin/sw-engine-pleskrun info.php | grep platform

  3. On a screen you will see a result of Plesk detection:

     • dedicated or none stands for physical hardware.
     • If parallels-server is shown, run systeminfo command to get BIOS Version: Parallels Software International Inc. 6.11.25122.123124 stands for Virtuozzo version 6, update 11.

• For Plesk 11.5 or older execute the following command:

  • Windows:

    C:\>"%plesk_bin%\php.exe" -dauto_prepend_file= -r "echo get_virtualization();"

  • Linux:

    # /usr/local/psa/bin/sw-engine-pleskrun -dauto_prepend_file= -r "echo get_virtualization();"

• On Linux, other utilities you can use (not related to Plesk) include dmidecode and lspci .

• Additionally, on Windows, the following steps may be followed to get BIOS information:

  • Run wbemtest in the command line.

  • Click Connect twice.

  • Click Query.

  • Execute:

    mysql> SELECT * FROM Win32_BIOS

    If this results in BIOS information similar to Version='ACRSYS - 1', the BIOS was hacked and the hack should be deactivated, or the license for Dedicated servers needs to be obtained.

    If the output suggests the lack of a virtual platform, there is no other way to make Plesk detect it other than to re-deploy it properly with the correct settings.

• Make sure that Plesk Management Service is up and running. Restart Plesk management services:

  • Windows:

    Login into server as Administrator Start menu > All programs > 'plesk services monitor' > Restart 'Plesk Management Services'

  • Linux:

    # /etc/init.d/psa stop $ /etc/init.d/psa start

• Confirm it using below command on the server:

  C:\> "%plesk_bin%\php.exe" -dauto_prepend_file= -r "echo get_virtualization();"
  xen

If this article did not help, check /usr/local/psa/admin/logs/panel.log file for exact error when trying to install or retrieve a license. If there are "Fork failed - Cannot allocate memory" errors found in panel.log , visit:

213959545 Error: Fork failed - Cannot allocate memory

Additional information

If server virtualization is detected as Xen but license still cannot be uploaded with the same error, visit:

# virt-what
xen