Sounds like it's finding the server, but the server isn't matching the MAC you've entered to the machine you're connecting. Is it possible that you've got the MAC address wrong? I certainly haven't seen every one in the world, but they're usually alphanumeric, not all numbers. Alternatively, you could test it from a web browser on a system that can contact that server by using:
http://[serveraddress]/screen/?mac=[in:se:rt:yo:ur:nu:mb:er](leave out the [ ] brackets for both server address and mac address. The MAC can be any number, so long as you've setup that number as a screen in concerto)--To view this discussion on the web visit https://groups.google.com/d/msg/concerto-digital-signage/-/DKwmW_njxhsJ.
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