This may be due to the NilAuthenticator. Open the drools-guvnor.war archive file and in it, you will find a file at /WEB-INF/components.xml. Open the document and comment this:
<security:identity
authenticate-method="#{nilAuthenticator.authenticate}"/>
And UNcomment this:
<security:identity authenticate-method="#{authenticator.authenticate}"
jaas-config-name="other"/>
I think that should fix your problem.