Updated permissions for the Auth server (again).

files/auth/config.json

@@ -65,7 +65,7 @@
 	// Note: The auth server needs to be able to talk to the sandbox server when authenticating (anonymous) students.
 	"SAND" : {
 	    "message_size" : 102400,
-	    "groups" : [ "AUTH", "ADMC", "DB" ]
+	    "groups" : [ "AUTH", "ADMC", "DB", "SAcl" ]
 	},
 
 	// Command-line tool for sandbox management.