@SAMSAL 

1. The system requirements in the admin guide portion of the Apache NiFi 2.0.0-M1 is incorrect.  Apache NiFi 2.0.0-M1 does require minimum of Java 21.

2. The SNI exception is caused by using an IP or using a hostname not found within the SAN of the PrivateKeyEntry located in the NiFi keystore.  This is per spec for Java 21.

3. It is not clear why you would want to configure a Managed-Authorizer and still use the Single-User-Provider for authentication?   Is this because you plan on having your other users authenticate via TLS certificates?  The Single User authentication and authorization providers were developed simply to allow an out-of-the-box secured NiFi setup.  If a multi-tenant setup is desired, neither the single-user-provider or single-user-authorizer should be used.

4. Jython was removed due to Security concerns via https://issues.apache.org/jira/browse/NIFI-12378.  
Apache NiFi 2.0.0 now natively supports Python allowing users to create python processors.  I am not aware of any that have been created yet.

5. I had no issue with UI in my Chrome browser (perhaps related to your Chrome version?).

If you found any of the suggestions/solutions provided helped you with your issue, please take a moment to login and click "Accept as Solution" on one or more of them that helped.

Thank you,
Matt