NiFi anonymous user access denied

[#1]

Every minute there is an annoying ranger audit log in our current cluster where anonymous is trying to access the /flow.

The client IP address is the same address as the NiFi node itself so it seems like the server itself is trying to access /flow but can't. 

Has anyone seen this before?

[#2]

Yes to allow anonymos user you can define {USER} in ranger nifi policy and you will not see these deny operation.