Port 5800 - VNC client through a browser

[Corne Beerse]

L.M. wrote:

>Hi,
>I am using "VNC Free Edition 4.1".
>
>o At PLACE_1, I have:
>~~~~~~~~~~~~~~~~~~~~~
>- a LAN "192.168.0.0/24" ;
>- a router with a public IP "W.X.Y.Z" ;
>- a host A="192.168.0.6" running a VNC server.
>
>o At PLACE_2, I have:
>~~~~~~~~~~~~~~~~~~~~~
>- a LAN "192.168.1.0/24" ;
>- a host B="192.168.1.2" on which I want to run a VCN viewer
>  (via a HTTP server) to connect to the VNC server running on A.
>
>o First situation:
>~~~~~~~~~~~~~~~~~~
>My router is configured to transmit everything it receives
>on its port 5900 to host A on the port 5900 (port forwar-
>ding).
>
>If I run a VNC viewer (not via a browser) on host B, I
>manage to connect the VNC server on host A. It succeeds.
>
>o Second situation:
>~~~~~~~~~~~~~~~~~~~
>- Now, if I configure my router so that everything it receives
>  on its port 5800 is transmitted to host A on port 5800
>- and type in a browser: http://W.X.Y.Z:5800/
>
>I have the following message:
>"java.net.ConnectException: Connection timed out: connect"
>
>o Notice:
>~~~~~~~~~
>If I run http://www.realvnc.com/cgi-bin/nettest.cgi on the server
>it says:
>  "The ip address requesting this web page is W.X.Y.Z (REMOTE_ADDR)
>   Connecting to port 5900 succeeded
>   Waiting from server to send version string"
>Why port 5900 and not port 5800?
>  
>

For the web-based viewer, you need to know it uses both port 5800 and 
5900. You point your browser to port 5800, which is a html-page that 
fetches a java-based vncviewer. This javabased vncviewer is verry 
similar to the binary viewer: it uses port 5900 for the vnc-communication.

The used html is relative simple. You can create your own page that 
starts the java code with options you like. If you fetch a unix (linux) 
variant of vnc and extract that, you can see a directory with the 
java-files in there. The other files are prepared html-pages (with an 
other extention) which you can use as a base for your webserver.

Keep in mind, if a java application is started from a html page, it can 
only connect to the server it comes from. Hence, that must do the prort 
forwarding. Since you control the html-page, you controll the options 
passed to the java-viewer, including the used port. As far as I know, 
only the commercial vnc-variant can speak both html and vnc over the 
same port. All others need to use 2 ports.



>Thanks in advance for your help.
>Leon
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