How to debug sec-wall issues

I cannot access the web-admin for one of my clusters. I am getting: UNAUTHORIZED path_info:[/zato/admin/invoke], cid:[K06JN8RR1BQV0KAKX6990MQKJB2P], sec-wall code:[0004.0003].

How can I debug this issue?

I am running the server in the foreground with a pdb statement at the location where the error is generated, but it is never triggered.

Regards, Jan