403 When viewing plugins/servlet/pr-harmony/*

We're receiving a 403 in one of our environments with with PR-Harmony enabled. This is occurring on an instance with a self signed SSL and on all directories. It returns a 403 both behind and in front of SSL. This is occurring on Stash version 3.11.1 and plugin version 1.8.2

Is there any way to enable debugging as there is nothing being pushed to the atlassian-stash.log or catalina.out.