Hi,
I’ve tested with this string - and it worked:
http://localhost/kurs/check_mk/view.py?_username=automation&_secret=MySecret&_transid=-1&_do_confirm=yes&_do_actions=yes&host=host21&_down_from_now=yes&_down_minutes=30&_down_comment=Test_Downtime&view_name=hoststatus
Karl