If you intend to use oXygen floating (concurrent) licenses, you need to use the oXygen license server.
The oXygen HTTP license server is available in several distributions, tailored for covering a variety of deployment configurations:
You can learn in the oXygen user manual how you can set-up the license sever and how an oXygen instance requests a floating license from the license server.
Looking for the old license server? You can find it here.