Article ID: 808, created on Oct 6, 2008, last review on Jul 25, 2016

  • Applies to:
  • Web Presence Builder
  • Plesk
  • Plesk Sitebuilder
  • Plesk Expand
  • Virtuozzo containers for Windows 4.6
  • Service provider products licensing


If you use any of the following product versions:

  • Plesk for Linux 7.1-8.2.1
  • Sitebuiler for Linux 1.x-2.1.3

and have issues with license update, refer to this article:

  • 126447 License fails to update or upgrade (legacy product versions)

If the license fails to update on Plesk for Windows 7.5 - 8.x installed on Windows XP/Windows Server 2003 (Microsoft Windows 5.2), see more details in article

  • 128114 License for Plesk 7.5/7.6 or 8.x for Windows fails to update

For other products and versions, please see the resolution below.


The product license fails to update. The following errors may occur:

Licensing Server Unreachable: Unable to connect with licensing server.
Please make sure that your network allows communication to
For more details check system help pages.


Couldn't resolve host name


Can't connect to (Timeout)


The product tries to connect to the license server at port 5224 to update the license, but it cannot establish a connection.


On December 1, 2014, the IP address of the license server was changed to (IPv4) and 2001:67c:730::80 (IPv6). Make sure that the hostname resolves to the proper IP from your server:

# nslookup

If the license server does not resolve to the correct IP, check the /etc/hosts file.

If any of these servers are behind a firewall and old IP addresses of Key Administrator are listed in the firewall rules, please add new IP addresses of Key Administrator to the firewall rules to allow your servers to connect to This can be checked with these commands, depending on your OS:


# nmap -P0 -p5224
# telnet 5224
# traceroute


telnet 5224


Note: Telnet Client should be installed additionally for Windows -> how to install Telnet Client

If you are using the APF firewall, check /etc/apf/allow_hosts.rules for the mentioned IPs or the hostname

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Warning: You are currently operating within the grace period of your product license. To update your product license, select the Retrieve Keys option on the License Management page.

Unable to update the license automatically


The license key is invalid. In order to use Panel, you need to obtain and install a new valid license key. Your license key has expired. To continue using your Panel, you must purchase a non-expiring commercial license key.

Plesk license doesnt avaliable

Error updating License

The product license key has expired. Please contact your service provider for assistance.

"Unable to connect to license server cURL error description: Failed to connect to port 5224: Timed out(7) "

Unable to connect to license server cURL error description: Couldn't resolve host name(6)

Retrieve keys does not work

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Error: Unable to connect to license server cURL error description: couldn't connect to server(7)

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Key Update Status Unable to connect to license server cURL error description: couldn't connect to server(7)

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