Article ID: 111887, created on Aug 15, 2011, last review on Sep 26, 2014

  • Applies to:
  • Plesk 10.x for Linux


The following error is displayed if you access to the Control Panel
Error: The license key is invalid. In order to use the Panel, please obtain and install a new valid license key.
Concerto not detected


If Plesk-Concerto license is installed on the server, Plesk tries to retrieve license from the PVC node by the use of  the vzlinkmgr service. If this service is stopped, the above error will be shown.


Make sure that services vzlicmon and vzlinkmg are running on the PVC node where container with Plesk is running. .
# service vzlicmon status
vzlicmonitor (pid  26738) is running...
[root@pvclin46centos5 ~]# service vzlinkmgr status
vzlinkmgr (pid 26766) is running...

If even one service is stopped, it is necessary to start it.
# service vzlinkmgr start
Starting vzlink manager: line 1 '# This is a comment
line 2 '0=/usr/sbin/vzaiproxy
line 3 '1=/usr/sbin/concerto'
service 0, handler '/usr/sbin/vzaiproxy'
service 1, handler '/usr/sbin/concerto'
                                                           [  OK  ]
# service vzlicmon start
Starting vzlicmonitor:                                     [  OK  ]

Please note that service vzlinkmgr will be automatically started if you start the vzlicmon service first.

Then check if you can access to the Control Panel.

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