Please try to enter another port number (right click on the remote host, Remote control, Configurer, Connection tab).
This message could also appears if a software running at the moment on the remote host or on the administration computer uses the same port than the one used by VNC (default : 5900).Read more : Windows XP firewall - Windows Vista firewall - Windows 7 / 8 / 10 firewall On these both computers, please also accept the TCP port used by VNC. Please create an exception in the firewall of the administration computer in order to accept "vncviewer.exe" and also an exception in the firewall of the remote host in order to accept "winvnc.exe". This message could also appears when a firewall (the native Windows firewall or another one) blocks the VNC software or the port used by this sofware (default : 5900 ).If necessary you should kill this task, then relaunch the connection. So, before launching again a remote control, you may check in the services/process list that the "winvnc" task is not running at this tiime. Indeed, when you stop the remote control, the software take some time (a few seconds) for properly leaving the beforehand established communication between the two computers. This message could appears when you have launched again the remote control too quickly after having finished another one, on the same remote host.Simplify your VNC Installation and Remote Control with IDEAL Administration (installed in 2 minutes)
Try IDEAL Administration during 30 days on your network for free! When I try to launch the remote control with TightVNC, I get the "Failed to connect to server" message, and I can't take the control of the remote host.
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