diff --git a/lib/interfaces.js b/lib/interfaces.js
index c205462..3911569 100644
--- a/lib/interfaces.js
+++ b/lib/interfaces.js
@@ -95,12 +95,13 @@ function mqttsFactory(iface, fallback, mosca) {
 
   return tls.createServer(credentials, buildWrap(mosca));
 }
-
 function httpFactory(iface, fallback, mosca) {
   var serve = buildServe(iface, mosca);
   var server = http.createServer(serve);
 
-  mosca.attachHttpServer(server);
+  server.on('listening', function () {
+    mosca.attachHttpServer(server);
+  });
   return server;
 }
 
diff --git a/test/server_error.js b/test/server_error.js
index cdeb098..4477d78 100644
--- a/test/server_error.js
+++ b/test/server_error.js
@@ -1,47 +1,77 @@
-var steed = require("steed");
+var steed = require('steed');
+var assert = chai.assert;
 
-var moscaSettings = function() {
-    return {
-        port: 1883
-    };
+var moscaSettings = function () {
+  return {
+    port: 1883,
+    http: {
+      port: 8000
+    }
+  };
 };
 
-describe("mosca.Server.error", function() {
-    var instance;
-    var secondInstance;
-    var settings;
+var moscaSettings2 = function () {
+  return {
+    port: 1884,
+    http: {
+      port: 8000
+    }
+  };
+};
 
-    beforeEach(function(done) {
-        settings = moscaSettings();
-        settings.publishNewClient = false;
-        settings.publishClientDisconnect = false;
-        instance = new mosca.Server(settings, done);
-        this.instance = instance;
-        this.settings = settings;
-        secondInstance = null;
 
-    });
+describe('mosca.Server.error', function () {
+  var instance;
+  var secondInstance;
 
-    afterEach(function(done) {
-        var instances = [this.instance];
+  beforeEach(function (done) {
+    instance = null;
+    secondInstance = null;
+    done();
+  });
 
-        if (secondInstance) {
-            instances.push(secondInstance);
-        }
+  afterEach(function (done) {
+    this.instance = instance;
+    var instances = [this.instance];
 
-        steed.each(instances, function(instance, cb) {
-            instance.close(cb);
-        }, function() {
-            setImmediate(done);
-        });
+    if (secondInstance) {
+      instances.push(secondInstance);
+    }
+
+    steed.each(instances, function (instance, cb) {
+      instance.close(cb);
+    }, function () {
+      setImmediate(done);
+    });
+  });
+  it('should get MQTT port Error: listen EADDRINUSE', function (done) {
+    this.timeout(10000); // have to wait for the inject with delay of two seconds
+    instance = new mosca.Server(moscaSettings(), function (err, server) {
+      assert.ifError(err);
+      expect(server === instance).to.be.true;
+    });
+    secondInstance = new mosca.Server(moscaSettings(), function (err, server) {
+      assert.ifError(err);
+      expect(server === secondInstance).to.be.true;
+    });
+    secondInstance.on('error', function (err) {
+      expect(err.toString().substr(0, 24)).to.be.equal('Error: listen EADDRINUSE');
+      done();
+    });
+  });
+  it('should get HTTP port Error: listen EADDRINUSE', function (done) {
+    this.timeout(10000); // have to wait for the inject with delay of two seconds
+    instance = new mosca.Server(moscaSettings(), function (err, server) {
+      assert.ifError(err);
+      expect(server === instance).to.be.true;
+    });
+    secondInstance = new mosca.Server(moscaSettings2(), function (err, server) {
+      assert.ifError(err);
+      expect(server === secondInstance).to.be.true;
     });
-    it("should get Error: listen EADDRINUSE :::1883", function(done) {
-        secondInstance = new mosca.Server(moscaSettings(), function(err, server) {
-            expect(server === secondInstance).to.be.true;
-        });
-        secondInstance.on('error', function(err) {
-            expect(err.toString()).to.be.equal("Error: listen EADDRINUSE :::1883");
-            done();
-        });
+    secondInstance.on('error', function (err) {
+      expect(err.toString().substr(0, 24)).to.be.equal('Error: listen EADDRINUSE');
+      done();
     });
+  });
 });
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