Administrative Systems Firewall Upgrade
On January 4th 2017 starting at 5AM Data Center Services will be upgrading the capabilities of the firewall supporting services which include Angel, eLion, Data Warehouse, Imaging, eSteward, Fit, GI, Paws, Trackits, LionPath, Canvas, and Workflow. The network change is scheduled from 5AM to 7AM, however the actual outage is expected to last roughly 30 min. During that 30 min period all users will be unable to access these services. Updates to this can be followed in CHG0039712 within ServiceNow.
More information: Administrative Systems Firewall Upgrade
Story added 22. December 2016, content source with full text you can find at link above.