Updated env names to sinatra

code/lib/handlers.js

@@ -44,7 +44,7 @@ module.exports = {
                             "Tunnel-Medium-Type": 6,
                             "Tunnel-Type": 13,
                             "Tunnel-Private-Group-Id": vlan,
-                            "Session-Timeout": config.radius.session_duration || 60
+                            "Session-Timeout": config.session_duration || 60
                         }
                     });
                     callback (response, null);