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Obtaining a license from a remote floating license server is not a supported mode of operation for Arm® development tools. You are strongly discouraged from attempting it.
It is technically possible for a client machine to obtain a license from a remote floating license server across a Wide Area Network (WAN). When you set up your licensing system, ensure that client machines have access to local floating license servers across your Local Area Network (LAN).
If you do attempt to use a WAN server, the additional network delays connecting to the server can dramatically increase the time taken by the Arm build tools to build your code. In many cases builds can actually fail if the time delays caused are too great. The high license traffic caused can also significantly increase the overall traffic on your WAN, that might lead to more general problems on your network.