@Alvin Jin
That authorizers.xml file looks a little off. This is what it should look like: <authorizers>
<authorizer>
<identifier>file-provider</identifier>
<class>org.apache.nifi.authorization.FileAuthorizer</class>
<property name="Authorizations File">./conf/authorizations.xml</property>
<property name="Users File">./conf/users.xml</property>
<property name="Initial Admin Identity">CN=nifiadmin, OU= NIFI.COM</property>
<property name="Legacy Authorized Users File"></property>
<!-- Provide the identity (typically a DN) of each node when clustered, see above description of Node Identity. -->
<property name="Node Identity 1">CN=nifi-0, OU=NIFI.COM</property>
<property name="Node Identity 2">CN=nifi-1, OU=NIFI.COM</property>
<property name="Node Identity 2">CN=nifi-2, OU=NIFI.COM</property>
</authorizer>
</authorizers>
You will have to remove the current users.xml and authorizations.xml file so NiFi will recreate them on restart.
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