Jenkins is planned to be down for ~1hour this coming Sunday night starting at ~1900 for configuration changes. The beginning/end of the maintenance period will be announced on #dm-jenkins.
jenkins maintenance activities are complete. However, github, which is used for authentication, is continuing to have problems which appear to be randomly interfering with end-user’s ability to connect to jenkins. See: https://status.github.com/messages
Github appears to have recovered most of its services early this morning, although some recovery is still ongoing, and jenkins is able to authenticate users per normal.