When connecting to an existing macOS target with Enterprise 7.4, the connection is successful but the Live Preview is blank. The adgselfhost.txt may have a message like the following:
https://:/api/v2.0/files 404 NotFound
Enterprise 7.4 is not backwards compatible with previous macOS Agents.
Uninstall any existing macOS Agents and install the new macOS Agent released with Forensic Tools 7.4.