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Article ID: 127756, created on Dec 14, 2015, last review on Jan 15, 2016


If you use Virtuozzo containers for Linux 2.6.1, 3.0.0 and have issues with license update, refer to this article:

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

For newer versions of Virtuozzo containers, please see the resolution below.


Virtuozzo 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.virtuozzo.com:5224.
For more details check system help pages.


Couldn't resolve host name


Can't connect to ka.virtuozzo.com:5224 (Timeout)


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


Since November 28, 2015, virtuozzo key administrator was moved to a separate domain from ka.odin.com to ka.virtuozzo.com.

Please make sure that ka.virtuozzo.com resolves to the proper IP from your server:

# nslookup ka.virtuozzo.com

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 please ensure that your servers are allowed to connect to ka.virtuozzo.com. This can be checked with these commands, depending on your OS:


# nmap -P0 -p5224 ka.virtuozzo.com
# telnet ka.virtuozzo.com 5224
# traceroute ka.virtuozzo.com


telnet ka.virtuozzo.com 5224

tracert ka.virtuozzo.com

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 ka.virtuozzo.com.

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