# When Mastodon Server is down, consider a proper 404 error message/image in Elk
Some functionality broken with older Mastodon versions
c: bugs: pending triage
Notifications in main screen should respect all/Mention setting
c: bugs: pending triage
Elk opens https://elk.zoneundefined instead of proper URL
c: bugs: pending triage
`GET https://aus.social/api/v1/push/subscription` 404
c: bugs: pending triage