Vnc stops updating mouse and keyboard

However, it may require advanced NAT, firewall and router configuration such as port forwarding in order for the connection to go through.

Users may establish communication through Virtual Private Network (VPN) technologies, including instant VPN applications (such as Log Me In Hamachi) to ease usage over the Internet, or as a LAN connection if VPN is used as a proxy, or through a VNC repeater (useful in presence of a NAT).

Several implementations also start a basic HTTP server on port 5800 N to provide a VNC viewer as a Java applet, allowing easy connection through any Java-enabled web-browser.

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One advantage of listening mode is that the server site does not have to configure its firewall to allow access on port 5900 (or 5800); the duty is on the viewer, which is useful if the server site has no computer expertise and the viewer user is more knowledgeable.

The server sends small rectangles of the framebuffer to the client.

In addition, the display that is served by VNC is not necessarily the same display seen by a user on the server.

On Unix/Linux computers that support multiple simultaneous X11 sessions, VNC may be set to serve a particular existing X11 session, or to start one of its own.

VNC is platform-independent – there are clients and servers for many GUI-based operating systems and for Java.

Multiple clients may connect to a VNC server at the same time.

In its simplest form, the VNC protocol can use a lot of bandwidth, so various methods have been devised to reduce the communication overhead.

For example, there are various encodings (methods to determine the most efficient way to transfer these rectangles).

VNC clients and servers negotiate their capabilities with handshaking in order to use the most appropriate options supported at both ends.

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