Citrix XenApp license acquisition error (-18): Unable to acquire a license from (SERVER NAME) server. Please contact your system administrator. Event ID – 12306 | Source – CPS Licensing You may get that error when launching published Application or Desktop from Citrix XenApp 6.5. Why am I writing about it now? Because I encountered it recently and the setting that resolved this issue is not a very common fix for XenApp License acquisition error -18. The plan was to segregate licenses for Citrix Virtual Apps and Desktop 1912 LTSR site and Citrix XenApp 6.5 farm by reallocating 600 concurrent (300 […]