https://community.cloudera.com/t5/Support-Questions/NiFi-Unknown-user-with-identity-admin-Contact-the-system/m-p/209271#M171225 <A rel="user" href="https://community.cloudera.com/users/86344/wluns32.html" nodeid="86344">@Seongmin Park</A><P>-</P><P>The log is telling you that authentication for your login user "admin" was successful; however, the authorization for that user was not.</P><P>-</P><P>There is nothing that stands out to me in your basic authorizers.xml file configuration. So my thought here is that this is not the original configuration of the authorizers.xml file. </P><P>The file-provider is used to initially generate the users.xml and authorizations.xml files. Once these files exist they will not be re-generated or modified if you later make changes to this configuration xml. Basically if the users.xml and authorizations.xml files already exist, the file-provider will do nothing.</P><P>-</P><P>I suggest taking a look at what is currently in your users.xml and authorizations.xml files. My guess here is that you will find that a user entry does not exist for "admin" in the users.xml file.</P><P>-</P><P>If you remove or rename these two files and restart your NiFi instance, the authorization will build new versions of these files based on the current configuration in your authorizers.xml file.</P><P>-</P><P>Thank you,</P><P>Matt</P><P>-</P><P>If you found this Answer addressed your original question, please take a moment to login and click "Accept" below the answer.</P> Thu, 02 Aug 2018 19:44:20 GMT MattWho 2018-08-02T19:44:20Z