Artifact Tarpit

hi ,
I want to control rate limiting in moqui using Artifact Tarpit entity , but it does not work and I can request as much as I want
1.I create artifact for rests (userRest)
2.create usergroup (admin)
3. add my user to this usergroup
4.create record in Artifact Tarpit entity with admin usergroup and userRest artifact
can anyone tell me , what should I do for handling rate limiting in moqui ?