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Enterprise Portal Collaboration with ArcGIS Online

Question asked by spatialinsiteesriorg on Jan 6, 2019

I'm attempting to set up an Enterprise Portal collaboration with ArcGIS online, and noted that in the list of pre-requisites listed here: Create a collaboration—Portal for ArcGIS (10.6) | ArcGIS Enterprise that each participant is required to trust the SSL certificate used by the other participants.  If my Enterprise Portal instance is internal, and uses a domain CA signed certificate, how can I go about registering this with ArcGIS Online?  If this is not possible, would this mean that my internal Enterprise portal must use a commercial CA, such as digicert?