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I have a server that needs to push a message to a client from which it received a request a few days ago. Now request which was received has the IP address of the NAT router behind which the client sits.

I was wondering if I could somehow push a message to a client (or somehow make a TCP connection) who doesn't have a public IP and is sitting behind a NAT router?

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Short answer: no.

Not unless you know the current public IP address of the destination's router and the router forwards the required transport-layer port (aka destination NAT or reverse NAT).

A very frequently used approach for this problem is that the client keeps polling the server.

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