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From: "Jason A. Donenfeld" <Jason@zx2c4.com>
Date: Sun, 30 Apr 2017 16:54:15 +0200
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Subject: Re: do a client behind NAT needs to define listening port?
To: Rostislav Belotserkovski <rost.bel@gmail.com>
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Yes.

If you're behind NAT, and want a server to be able to establish a
connection to you, enable PersistentKeepalive.