DWR

Are you talking about the reverse-ajax case, or any connection?

DWR itself doesn't throw any exceptions on connection lost - it does however call the errorHandler, and it includes information about the cause of the error as it does this.

I'm referring to any connection (not reverse-ajax). The Object that is returned within Firefox 2 is the following. How can I tell from this object that a "connection lost" occurred as opposed to some other problem? Please let me know if you need more information.

[Exception... "Component returned failure code: 0x80040111 (NS_ERROR_NOT_AVAILABLE) [nsIXMLHttpRequest.status]" nsresult: "0x80040111 (NS_ERROR_NOT_AVAILABLE)" location: "JS frame :: http://localhost/dwr/engine.js :: anonymous :: line 812" data: no]

So you're saying that you do:

try {
Remote.method(params...);
}
catch (ex) {
console.debug(ex);
}

And you get the above?

I'm using the following technique. The Exception above is actually being sent to the 'warningHandler' callback.

function sendNote() {
Note.notify(sTicket, {
callback:function(bFlag)
{ alert("Still connected."); },
exceptionHandler:function(exception)
{ communicationError(exception); },
errorHandler:function(errorString, exception)
{ communicationError(exception); },
warningHandler:function(errorString, exception)
{ communicationError(exception); } }
});
}