Unfortunately, setLockscreenVisibility() doesn't seem to have any
effect. So the full notification is shown unless the user manually
configures the notification settings.
This is either because a third-party VPN app has the always-on feature
enabled, or because the user denied the permission in the system's confirmation
dialog.
If the always-on feature is enabled for a connection of the built-in VPN
client we get an IllegalStateException, for which we show an updated and
clearer error message.
The file format is documented on the wiki.
URLs to .sswan files may be intercepted and downloaded files with a media
type of application/vnd.strongswan.profile may also be opened (the file
extension doesn't matter in that case). Whether downloaded files for which
the media type is not correct but the extension is .sswan can be opened
depends on the app that issues the Intent. For instance, from the default
Downloads app it won't work due to the content:// URLs that do not contain
the file name but when opening the downloaded file from within Chrome's
Downloads view it works as these Intents use file:// URLs, which contain
the complete file name (the latter requires a new permission).
The term "gateway" is unfamiliar for most new users (or they confuse it
with the default gateway of their network) but they usually know that
they want to connect to a "server".
Tobias Brunner