diff --git a/install/usr/share/swarmlab.io/sec/project/courses/example-helloworld/app/helloworld.js b/install/usr/share/swarmlab.io/sec/project/courses/example-helloworld/app/helloworld.js
deleted file mode 100644
index 14b15f3..0000000
--- a/install/usr/share/swarmlab.io/sec/project/courses/example-helloworld/app/helloworld.js
+++ /dev/null
@@ -1,90 +0,0 @@
-const app = require('express')();
-const http = require('http').Server(app);
-var path = require('path');
-var io = require('socket.io')(http);
-const MongoClient = require('mongodb').MongoClient;
-
-
-app.get('/', (req, res) => {
-  res.send('<h1>Hello world!</h1>');
-});
-
-app.get('/test', (req, res) => {
-
-
-            var user="test1"
-            var pass="newpass"
-              //mongo “mongodb://localhost:30001,localhost:30002,localhost:30003/$MONGO_INITDB_DATABASE” -u $MONGO_INITDB_USERNAME mongo “mongodb://localhost:30001,localhost:30002,localhost:30003/app_swarmlab” -u app_swarmlab
-             //mongodb://host1:27017,host2:27017,host3:27017/?replicaSet=myRs
-             //var mongourl = "mongodb://"+user+":"+pass+"@localhost:30001,localhost:30002,localhost:30003/app_swarmlab?replicaSet=rs0&authSource=admin"
-  /*
-  use admin
-db.createUser(
-   {
-     user: "test1",
-     pwd: 'newpass',      // Or  "<cleartext password>"
-     roles: [ { role: "readWrite", db: "app_swarmlab" } ],
-     authenticationRestrictions: [ {
-        clientSource: ["192.168.1.7"],
-        serverAddress: ["192.168.80.2", "192.168.80.3", "192.168.80.4"]
-     } ]
-   }
-)
-*/
-
-            var mongourl = "mongodb://"+user+":"+pass+"@192.168.80.2:27017/app_swarmlab?replicaSet=rs0&authSource=admin"
-            const OPTS = {
-              useNewUrlParser: true,
-              useUnifiedTopology: true
-            };
-var options = {
-    useNewUrlParser: true,
-      useUnifiedTopology: true
-}
-
-
-            MongoClient.connect(mongourl, options, function(err, client){
-                if(err){
-                    console.log(err);
-                } else {
-                  console.log(JSON.stringify('mongo ----------------connected'))
-                  const db = client.db('app_swarmlab');
-                  db.collection('logs').find({}).toArray()
-                      .then(item => {
-                          console.log('item '+JSON.stringify(item))
-                          for (let i in item) {
-                            console.log(JSON.stringify('items' + item[i]))
-                           }
-                        })
-
-                }
-            })
-  res.send('<h1>test!</h1>');
-
-});
-
-
-
-
-
-io.on('connection', s => {
-      console.error('socket connection');
-
-   s.on('log', (data, room) => {
-      s.to('iot').emit('message', data);
-      console.log('broadcast', data);
-
-  });
-    //s.emit('message', 'message from server');
-
-
-
-});
-
-
-
-
-
-http.listen(8084, () => {
-  console.log('listening on *:8084');
-});
diff --git a/install/usr/share/swarmlab.io/sec/swarmlab-sec b/install/usr/share/swarmlab.io/sec/swarmlab-sec
index dbf051c..4641eec 100755
--- a/install/usr/share/swarmlab.io/sec/swarmlab-sec
+++ b/install/usr/share/swarmlab.io/sec/swarmlab-sec
@@ -334,7 +334,6 @@ services:
       - ${HYBRID_NETWORK}
     volumes:
       - $Wdir/project:/home/docker/project
-      - /tmp/.X11-unix:/tmp/.X11-unix
 
  
   worker:
@@ -352,7 +351,6 @@ services:
       - ${HYBRID_NETWORK}
     volumes:
       - $Wdir/project:/home/docker/project
-      - /tmp/.X11-unix:/tmp/.X11-unix
 
 networks:
   ${HYBRID_NETWORK}: