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there is such a thing as a reverse connection, but that still involves forwarding ports, instead of the viewer computer initiating a connection to the viewed(and the viewed computer running a server and the NAT router near the viewed server having port forwarding done to the viewed computer).. In a reverse . connection the viewed computer initiates a connection, and the viewer computer's router has to have port forwarding set up. So it is done when a technical person wants to view somebody elses computer, the techie takes on the burden of port forwarding.– barlopCommented May 29, 2022 at 21:04
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also many people use teamviewer rather than vnc.. so as to avoid port forwarding!– barlopCommented May 29, 2022 at 21:04
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@barlop so you're saying there is port forwarding being done but by the intermediate RealVNC server? What I do not fully understand is how in such a reverse connection this server manages to control my viewed computer, as this would require it to be accessible from outside right? And secondly how does teamviewer work exactly then?– overclockingTheRefrigeratorCommented May 29, 2022 at 21:31
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In regard to your question re intermediate server and reverse connection. In a reverse connection, there is no "intermediate" server.. it's just that instead of A connecting to B, B connects to A. So there is still port forwarding it's just on the viewer end rather than the viewed end.– barlopCommented May 29, 2022 at 23:19
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In regard to your question of how it's possible for a computer to be controlled and wouldn't that require it to be accessible from outside. Well, when you browser the internet you don't forward any ports at your end but your computer is still controlled by your web browser / whatever software is on it. You are at the mercy of whatever programs are on your computer!– barlopCommented May 29, 2022 at 23:20
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