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if this is a lab i'd suggest you rebuild the lab (doesn't take long) and before converting the lab to PKI take snapshots of the virtual machines, so you have different states (http/https/e-http) if you cannot do that then you'll have to experiment with removing bindings in IIS for https, removing the certificates to the dp role and more, and removing certificate services, quite a mess, you could basically undo all the settings where you switched to HTTPS back to HTTP