Īlthough most Citrix products can cope with a temporary loss of the Citrix License Server using grace periods, it can be cumbersome when you have non-persistent systems. With a Windows based Citrix License Server you need to rely on VMware HA (or equivalent) to detect a failure, boot the machine on another host and wait for the service to come back (not protecting against logical errors). When combined with an intelligent load balancer (like the Citrix NetScaler) this offers a great solution for a high available license server. This means you can import the same license file (where the hostname is included) in multiple appliances. The Citrix License Server virtual appliance is hosted on a Linux platform which offers one huge benefit: multiple instance can exist in a network with the same hostname. Why do you need Citrix License Server VPX? Technically it shouldn’t be too difficult to support other hypervisors ( some people tried), they already do for the NetScaler VPX. Citrix refuses to release an appliance for other hypervisors then their own, let alone supporting other hypervisors. If you’re company is using VMware vSphere (or Microsoft Hyper-V) you’re unable to use the virtual appliance. The appliance is available since July 2010, in the 2.5 years the appliance is available only Citrix XenServer is supported. With the release of Citrix XenServer 5.6 Citrix also released a new virtual appliance dedicated to licensing, the License Server VPX.
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March 2023
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