Hi Ben,

ExtJS has a default 30 second timeout for all of the AJAX request that you make through its APIs. After 30 seconds, it kills the connection, which usually shows an error dialog in the client. The server also notices that the browser connection is closed and cancels the query since there's nobody to send it to anymore, so you get that exception in the log. We should probably filter them out since it's not really an error, it just means that the browser disconnected.

You can use the Ext.Ajax.timeout to control how long it waits to give up on the connection. I believe you can disable the timeout completely by setting it to 0.

Thanks,
Josh