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:
- 213404169 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
- 213377529 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 ka.plesk.com:5224.
For more details check system help pages.
Couldn't resolve host name
Can't connect to ka.plesk.com:5224 (Timeout)
Plesk is not accessible:
Error: The licanse key is invalid. in order to use Plesk, please obtain and install a new valid license key.
Your license key has expired. To continue using your Plesk, you must purchase a non-expiring commercial license key.
The product tries to connect to the license server
ka.plesk.com on TCP 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 126.96.36.199 (IPv4) and 2001:67c:730::80 (IPv6). Make sure that the hostname
ka.plesk.com resolves to the proper IP from your server:
# nslookup ka.plesk.com
If the license server does not resolve to the correct IP, check the
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
ka.plesk.com . This can be checked with these commands, depending on your OS:
# nmap -P0 -p5224 ka.plesk.com
# telnet ka.plesk.com 5224
# traceroute ka.plesk.com
telnet ka.plesk.com 5224
Note: Telnet client should be installed additionally for Windows -> how to install Telnet client
If APF firewall is used, check
/etc/apf/allow_hosts.rules for the mentioned IPs or the hostname