Troubleshooting

You will need console logging support in the browser. Recent Chrome and Opera versions have built in support. Firefox has a nice extension called "firebug" that gives console logging support.

First, load the noVNC page with logging=debug added to the query string. For example vnc.html?logging=debug.

Then, activate the console logger in your browser. With Chrome it can be activate using Ctrl+Shift+J and then switching to the "Console" tab. With firefox+firebug, it can be activated using Ctrl+F12.

Now reproduce the problem. The console log output will give more information about what is going wrong and where in the code the problem is located.

If you file a issue/bug, it is very helpful for me to have the last page of console output leading up the problem in the issue report. Other helpful issue/bug information: browser version, OS version, noVNC git version, and VNC server name/version.