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I am using a program called Memoq that listens on port 2705. I would like to make it accessible from the internet, but it is failing for unknown reasons.

The setup looks like this: Internet -> Router -> Server -> Virtualbox computer with Memoq

I set the router to forward port 2705 to the server and Virtualbox to forward port 2705 from host to guest (using NAT). I disabled firewall on both computers (they run Windows).

If I try to telnet to port 2705 from virtualbox and server it works, but if i do the same from some other computer (internet or network) it fails.

I'm not a network expert, how could I find out what is wrong?

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    Virtualbox is not a reasonable hypervisor technology to be using as an IT professional. Put a real hypervisor on your server. Aug 23, 2016 at 15:37
  • I don't really need professional level of service. Quick, dirty & free is good enough in this specific case.
    – SimZal
    Aug 23, 2016 at 15:40

1 Answer 1

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Your problem is most likely that you're double-NAT'ing the traffic via both your router and the host server.

I would personally move the VM to use bridged networking, and then port-forward straight to the VM from your router.


I also agree wth HopelessN00b's comment that you should be replacing VirtualBox with a decent hypervisor, such as HyperV on Windows.

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  • Thanks, bridged connection really helped. I solved the problem with your help.
    – SimZal
    Aug 23, 2016 at 18:15

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