No problem, glad it was helpful 🙂 If you are reaching the login screen, then it means your browser is not forwarding your credentials to NiFi. You could try setting the negotiate properties to just "myhost.de" instead of the full url with port. Another thing to look at might be the domain being used by your KDC... In this example I was using nifi.apache.org as the domain, so I had to add a mapping in /etc/hosts to map nifi.apache.org to localhost so I could use nifi.apache.org in my browser to access my local NiFi. If you are accessing myhost.de to get to your NiFi instance, but that isn't the domain in your KDC, then it won't line up and probably won't forward your credentials.
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