There is an issue in the QS server, the error with event id 300 is comming during the login and the error message is follows,
"The description for Event ID 300 from source QlikSenseServer cannot be found. Either the component that raises this event is not installed on your local computer or the installation is corrupted. You can install or repair the component on the local computer.
If the event originated on another computer, the display information had to be saved with the event.
The following information was included with the event: