Apache Nifi and Registry in secure environment - Buckets are not available

Question

Here is our setup:

set up secure nifi
set up secure registry
both on the same machine
created user in registry with CN=[hostname], OU=NiFi with read right on buckets and proxy user requests enabled
created Registry client in the nifi instance with https://[hostname]:[port]
when trying to start version control on a process group, buckets are loading for a split second, then showing -> "no available buckets"
activated logging on DEBUG level, can see the proxy request, but no authorization
when listening to the registry port with netstat, we can see registry listening on that port
when trying to retrieve buckets through nifi, connection is established, but no buckets can be seen

Additional information:

We have created buckets, adding both the admin user and the user which is used for the connection in registry to their policies.
We encounter no error when trying to retrieve the buckets, neither in the UI nor anywhere in the logs (with highest logging level activated).
We have seen several set up videos and many open threads but the suggested solutions are not solving our problem.
We suspect a permission problem, but are unable to detect the root of the problem
if necessary logs can be provided

Answers (1)