http://nmap.org/book/man-port-scanning-techniques.html - this page lists technique that allows to probe if a UDP post if closed. It would be awesome to see green button that lights up when you complete IP entry in configuration dialog.
more sync intervals
I’d like to ask if you could add some more intervals for syncing. The 1st hour should have more steps to choose, e.g. 5, 10, 15, 30, 45 minutes.
Please find attached a patch. I didn’t compile it and did it in theory.
Thanks a lot for considering it.