Just a thought...
Are you using the IRIS ODBC Driver when connecting to IRIS from DBeaver (or C#)?
Hi. Note (which should be obvious), the typo in that there are only two 't's in http, so:
http://localhost:52773/terminal/
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So, as others have confirmed here, to recap, installing Ensemble 2018 on an instance of Windows that already has IIS installed - plus, you take the defaults when installing Ensemble .. should have installed the CSP gateway on IIS.
Is there an installation log file worth reviewing for any clues ? (I believe there is ensemble-install log in the installation root folder).