Is it required to purchase a CA-signed certificate for the ArcGIS entrperise when we have 4 tiers.my client wants to use the SSL as their CA certifcate is used for production only Jonathan Quinn . There are many implicatios for the SSL when portal and arcgis configured in federation and hosting. How can we assure the best practices, and how the openSSL can serve in this matter if the application is in 1. Inreanet, 2. Internet. what is the pre-requist for the SSL with the domain certficate for the ArcGIS base deployment.