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(Tight)VNC server at the remote desktop is set up well. This I could verify by connecting to it from my PC (Ubuntu 18.04). But when I try to login to the server from my laptop (Ubuntu 16:04) using Real VNC (client), I get an error message which says: Unable to connect via my_ip:port: VNC viewer was unable to negotiate a connection with the proxy due to a protocol error

Can anyone help?

Update: I am able to access the remote server using Remmina remote desktop client. The problem with Real VNC still persists.

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  • Which version of Ubuntu? Which VNC server? Which VNC client? Please edit and update your question.
    – user68186
    Mar 8, 2020 at 12:32
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    @user68186 Done. I have many different versions of VNC in my laptop. However, Real VNC is run as default when I write "vncviewer" on terminal.
    – SKR
    Mar 8, 2020 at 12:43

1 Answer 1

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I use RealVNC to connected the remote windows, I also found the issue today, but after I change the Properties -> Expert -> Filter:proxy -> ProxyTcpRfb, set value = false, It works again.

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