After completing the steps in the previous section, the LoadMaster is now licensed.

The LoadMaster periodically checks for the presence of the locally activated license (Kemp 360 Central). If the locally activated license cannot be found, or there are any errors, an error message is displayed and the VLM stops working after a predetermined length of time based on your agreement with Kemp. If an activation check fails, an error message appears on the LoadMaster home screen indicating that activation failed.

The association between a LoadMaster and a license in Kemp 360 Central depends on the LoadMaster’s MAC address on the interface on which the administrative IP address of the LoadMaster resides. In most hypervisors, it is possible to modify the MAC address of a VM; this should be avoided by disabling MAC address changes in the hypervisor.

If the MAC address of a LoadMaster that obtained its license from Kemp 360 Central changes, the following occurs:

  • The LoadMaster is no longer recognized by Kemp 360 Central as having a valid license; it enters its licensing renewal grace period after its next daily attempt to contact Kemp 360 Central.
  • Attempts to license the LoadMaster again are refused by Kemp 360 Central because a managed device at the LoadMaster’s IP and port already exists in the device tree.

The workaround is to:

  1. Remove the existing LoadMaster device from Kemp 360 Central by selecting it in the device tree and clicking the delete (minus) icon at the lower left of the UI.
  2. Opening the LoadMaster WUI and requesting a new license from Kemp 360 Central.