Linked Data ->Sponger ->Configuration tab: 
Sponger ACLs from Linkied Data -> Access Control -> Sponger: 
Add New Rule button to add a new rule: 

Add: 
Apply: 

To disable for execution the default web service /about endpoint, execute the following steps:
Web Services -> Web Service Endpoint and select HTTP Host Edit for "/about": 
SOAP User to nobody from the drop down list box of available users: 