Today (February 14, 2019) at approximately 10:00EST our business lost connectivity to ArcGIS Online for about 5 minutes. Any url that was using http was coming back with an having an unreachable address. Forcing https seemed to correct the issue. This same thing happened on February 8, 2019 around the same time of day.
Just being curious as to if this happened to anyone else and if it is a somehow related to the TLS 1.2 push slated for April.