That causes the UltraVNC Viewer to bring up the following message:

The messagebox has two disadvantages:
- it is not topmost, if the user clicks next to it, the message disappears in the background and the user can't see it anymore
- it does not auto-connect on its own as long as the box is there, the user has to click the ok button that the viewer tries to re-connect
It would be enough to see the re-connection attempts in the title bar, but the user should not have to do any action for a re-connection and it should try to re-connect forever.
How can I achieve an unlimited auto-re-connect from the UltraVNC Viewer without having any user action required?