TREX search results for anonymous

Hello,

How could make that following link to work for anonymous users ? When try to see the search results, I have to authentification.

http://localhost:50000/irj/servlet/prt/portal/prtroot/com.sap.km.cm.service?StartPage=SearchPage&ConfigFileName=Navigation.xml&layoutSetMode=exclusive&ResourceListType=com.sapportals.wcm.SearchResultList&SearchType=quick&QueryString=string

Best Regards