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I'm not sure if ngrok would work - my understanding was that they only offer public domain names, which point to (a limited amount of) their IP addresses, and which client to route to is distinguished by HTTP Host header (eventually SNI). Which wouldn't be usable in this case, since you're dealing with raw TCP

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FWIW my echo failed smoke test when I tried with ngrok using the IP I got from dig. Strange thing is that the server still received the test payloads over ngrok, and my echo passes when hosted on EC2. Not sure if it's something with ngrok or if there's some other incompatibility (I'm a windows user :/)

I did not look at the implementation but since they offer pure TCP exposure it should work juste fine byt resolving the DNS, when you use a TCP service there is no host header in the protocol.

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