Alright, sounds like you’ve set up a Unreal Tournament '99 server in AMP, but people on the outside can’t join. LAN works though, so it’s likely a port-forwarding thing, as Mike pointed out.
First things first: verify what ports your UT99 server is using. Head over to your instance in AMP, search “Networking” in the top-right search bar, and double-check the port settings.
Let me know what you see so we can figure out if it’s a misconfigured port or something bigger. 
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