diff --git a/.gitlab-ci.yml b/.gitlab-ci.yml
index bfccec766..63fa83708 100644
--- a/.gitlab-ci.yml
+++ b/.gitlab-ci.yml
@@ -169,21 +169,25 @@ job_integration_autowizard_ff:
   tags:
     - browser-ff
   script:
-    - export BROWSER_URL=http://$IP:3001
+    - export BROWSER_PORT=3001
+    - export WS_PORT=3002
+    - export BROWSER_URL=http://$IP:$BROWSER_PORT
     - RAILS_ENV=test rake db:create
     - cp contrib/auto_wizard_example.json auto_wizard.json
     - script/bootstrap.sh
     - rake assets:precompile
-    - script/build/test_startup.sh $RAILS_ENV 3001 3002
-    - ruby -I test/ test/integration/auto_wizard_test.rb || script/build/test_shutdown.sh $RAILS_ENV 3011 3012 1
-    - script/build/test_shutdown.sh $RAILS_ENV 3001 3002
+    - script/build/test_startup.sh $RAILS_ENV $BROWSER_PORT $WS_PORT
+    - ruby -I test/ test/integration/auto_wizard_test.rb || script/build/test_shutdown.sh $RAILS_ENV $BROWSER_PORT $WS_PORT 1
+    - script/build/test_shutdown.sh $RAILS_ENV $BROWSER_PORT $WS_PORT
 
 job_integration_browser_ff_1:
   stage: browser
   tags:
     - browser-ff
   script:
-    - export BROWSER_URL=http://$IP:3011
+    - export BROWSER_PORT=3011
+    - export WS_PORT=3012
+    - export BROWSER_URL=http://$IP:$BROWSER_PORT
     - unset MAILBOX_AUTO1
     - unset MAILBOX_AUTO2
     - unset MAILBOX_MANUAL1
@@ -192,16 +196,18 @@ job_integration_browser_ff_1:
     - RAILS_ENV=test rake db:create
     - script/bootstrap.sh
     - rake assets:precompile
-    - script/build/test_startup.sh $RAILS_ENV 3011 3012
-    - rake test:browser || script/build/test_shutdown.sh $RAILS_ENV 3011 3012 1
-    - script/build/test_shutdown.sh $RAILS_ENV 3011 3012
+    - script/build/test_startup.sh $RAILS_ENV $BROWSER_PORT $WS_PORT
+    - rake test:browser || script/build/test_shutdown.sh $RAILS_ENV $BROWSER_PORT $WS_PORT 1
+    - script/build/test_shutdown.sh $RAILS_ENV $BROWSER_PORT $WS_PORT
 
 job_integration_browser_ff_2:
   stage: browser
   tags:
     - browser-ff
   script:
-    - export BROWSER_URL=http://$IP:3021
+    - export BROWSER_PORT=3021
+    - export WS_PORT=3022
+    - export BROWSER_URL=http://$IP:$BROWSER_PORT
     - unset MAILBOX_AUTO1
     - unset MAILBOX_AUTO2
     - unset MAILBOX_MANUAL1
@@ -210,44 +216,50 @@ job_integration_browser_ff_2:
     - RAILS_ENV=test rake db:create
     - script/bootstrap.sh
     - rake assets:precompile
-    - script/build/test_startup.sh $RAILS_ENV 3021 3022
-    - rake test:browser || script/build/test_shutdown.sh $RAILS_ENV 3021 3022 1
-    - script/build/test_shutdown.sh $RAILS_ENV 3021 3022
+    - script/build/test_startup.sh $RAILS_ENV $BROWSER_PORT $WS_PORT
+    - rake test:browser || script/build/test_shutdown.sh $RAILS_ENV $BROWSER_PORT $WS_PORT 1
+    - script/build/test_shutdown.sh $RAILS_ENV $BROWSER_PORT $WS_PORT
 
 job_integration_browser_ff_3:
   stage: browser
   tags:
     - browser-ff
   script:
-    - export BROWSER_URL=http://$IP:3031
+    - export BROWSER_PORT=3031
+    - export WS_PORT=3032
+    - export BROWSER_URL=http://$IP:$BROWSER_PORT
     - script/build/test_slice_tests.sh 3
     - RAILS_ENV=test rake db:create
     - script/bootstrap.sh
     - rake assets:precompile
-    - script/build/test_startup.sh $RAILS_ENV 3031 3032
-    - rake test:browser || script/build/test_shutdown.sh $RAILS_ENV 3031 3032 1
-    - script/build/test_shutdown.sh $RAILS_ENV 3031 3032
+    - script/build/test_startup.sh $RAILS_ENV $BROWSER_PORT $WS_PORT
+    - rake test:browser || script/build/test_shutdown.sh $RAILS_ENV $BROWSER_PORT $WS_PORT 1
+    - script/build/test_shutdown.sh $RAILS_ENV $BROWSER_PORT $WS_PORT
 
 job_integration_autowizard_chrome:
   stage: browser
   tags:
     - browser-chrome
   script:
-    - export BROWSER_URL=http://$IP:3071
+    - export BROWSER_PORT=3071
+    - export WS_PORT=3072
+    - export BROWSER_URL=http://$IP:$BROWSER_PORT
     - RAILS_ENV=test rake db:create
     - cp contrib/auto_wizard_example.json auto_wizard.json
     - script/bootstrap.sh
     - rake assets:precompile
-    - script/build/test_startup.sh $RAILS_ENV 3071 3072
-    - ruby -I test/ test/integration/auto_wizard_test.rb || script/build/test_shutdown.sh $RAILS_ENV 3071 3072 1
-    - script/build/test_shutdown.sh $RAILS_ENV 3071 3072
+    - script/build/test_startup.sh $RAILS_ENV $BROWSER_PORT $WS_PORT
+    - ruby -I test/ test/integration/auto_wizard_test.rb || script/build/test_shutdown.sh $RAILS_ENV $BROWSER_PORT $WS_PORT 1
+    - script/build/test_shutdown.sh $RAILS_ENV $BROWSER_PORT $WS_PORT
 
 job_integration_browser_chrome_1:
   stage: browser
   tags:
     - browser-chrome
   script:
-    - export BROWSER_URL=http://$IP:3041
+    - export BROWSER_PORT=3041
+    - export WS_PORT=3042
+    - export BROWSER_URL=http://$IP:$BROWSER_PORT
     - unset MAILBOX_AUTO1
     - unset MAILBOX_AUTO2
     - unset MAILBOX_MANUAL1
@@ -256,16 +268,18 @@ job_integration_browser_chrome_1:
     - RAILS_ENV=test rake db:create
     - script/bootstrap.sh
     - rake assets:precompile
-    - script/build/test_startup.sh $RAILS_ENV 3041 3042
-    - rake test:browser || script/build/test_shutdown.sh $RAILS_ENV 3041 3042 1
-    - script/build/test_shutdown.sh $RAILS_ENV 3041 3042
+    - script/build/test_startup.sh $RAILS_ENV $BROWSER_PORT $WS_PORT
+    - rake test:browser || script/build/test_shutdown.sh $RAILS_ENV $BROWSER_PORT $WS_PORT 1
+    - script/build/test_shutdown.sh $RAILS_ENV $BROWSER_PORT $WS_PORT
 
 job_integration_browser_chrome_2:
   stage: browser
   tags:
     - browser-chrome
   script:
-    - export BROWSER_URL=http://$IP:3051
+    - export BROWSER_PORT=3051
+    - export WS_PORT=3052
+    - export BROWSER_URL=http://$IP:$BROWSER_PORT
     - unset MAILBOX_AUTO1
     - unset MAILBOX_AUTO2
     - unset MAILBOX_MANUAL1
@@ -274,16 +288,18 @@ job_integration_browser_chrome_2:
     - RAILS_ENV=test rake db:create
     - script/bootstrap.sh
     - rake assets:precompile
-    - script/build/test_startup.sh $RAILS_ENV 3051 3052
-    - rake test:browser || script/build/test_shutdown.sh $RAILS_ENV 3051 3052 1
-    - script/build/test_shutdown.sh $RAILS_ENV 3051 3052
+    - script/build/test_startup.sh $RAILS_ENV $BROWSER_PORT $WS_PORT
+    - rake test:browser || script/build/test_shutdown.sh $RAILS_ENV $BROWSER_PORT $WS_PORT 1
+    - script/build/test_shutdown.sh $RAILS_ENV $BROWSER_PORT $WS_PORT
 
 job_integration_browser_chrome_3:
   stage: browser
   tags:
     - browser-chrome
   script:
-    - export BROWSER_URL=http://$IP:3061
+    - export BROWSER_PORT=3061
+    - export WS_PORT=3062
+    - export BROWSER_URL=http://$IP:$BROWSER_PORT
     - unset MAILBOX_AUTO1
     - unset MAILBOX_AUTO2
     - unset MAILBOX_MANUAL1
@@ -292,6 +308,6 @@ job_integration_browser_chrome_3:
     - RAILS_ENV=test rake db:create
     - script/bootstrap.sh
     - rake assets:precompile
-    - script/build/test_startup.sh $RAILS_ENV 3061 3062
-    - rake test:browser || script/build/test_shutdown.sh $RAILS_ENV 3061 3062 1
-    - script/build/test_shutdown.sh $RAILS_ENV 3061 3062
+    - script/build/test_startup.sh $RAILS_ENV $BROWSER_PORT $WS_PORT
+    - rake test:browser || script/build/test_shutdown.sh $RAILS_ENV $BROWSER_PORT $WS_PORT 1
+    - script/build/test_shutdown.sh $RAILS_ENV $BROWSER_PORT $WS_PORT
diff --git a/public/assets/chat/znuny.html b/public/assets/chat/znuny.html
index 79d43434f..0f3ef9c2f 100644
--- a/public/assets/chat/znuny.html
+++ b/public/assets/chat/znuny.html
@@ -89,7 +89,7 @@
         <label for="flat">Flat Design</label>
     <tr>
       <td>
-        <input type="color" id="color" value="#AE99D6" data-option="color"> 
+        <input type="color" id="color" value="#AE99D6" data-option="color">
       <td>
         <label for="color">Color</label>
     <tr>
@@ -118,10 +118,32 @@
 <script src="jquery-2.1.4.min.js"></script>
 <script src="chat.js"></script>
 <script>
+  function getSearchParameters() {
+        var prmstr = window.location.search.substr(1);
+        return prmstr != null && prmstr != '' ? transformToAssocArray(prmstr) : {};
+  }
+  function transformToAssocArray( prmstr ) {
+      var params = {};
+      var prmarr = prmstr.split('&');
+      for ( var i = 0; i < prmarr.length; i++) {
+          var tmparr = prmarr[i].split('=');
+          params[tmparr[0]] = tmparr[1];
+      }
+      return params;
+  }
+  var hostname = window.location.hostname;
+  var port = window.location.port;
+  var params = getSearchParameters();
+  var host = 'ws://localhost:6042'
+  if (params['port']) {
+    host = 'ws://' + hostname + ':' + params['port']
+  }
+  cssUrl = 'http://' + hostname + ':' + port + '/assets/chat/chat.css'
+
   var chat = new ZammadChat({
     chatId: 1,
-    host: 'ws://localhost:6042',
-    cssUrl: 'http://localhost:3000/assets/chat/chat.css',
+    host: host,
+    cssUrl: cssUrl,
     debug: true,
     background: '#494d52',
     flat: true,
diff --git a/test/browser/chat_test.rb b/test/browser/chat_test.rb
index 4409b4bbd..07372864e 100644
--- a/test/browser/chat_test.rb
+++ b/test/browser/chat_test.rb
@@ -43,7 +43,7 @@ class ChatTest < TestCase
     customer = browser_instance
     location(
       browser: customer,
-      url:     "#{browser_url}/assets/chat/znuny.html",
+      url:     "#{browser_url}/assets/chat/znuny.html?port=#{ENV['WS_PORT']}",
     )
     sleep 4
     exists_not(
@@ -191,7 +191,7 @@ class ChatTest < TestCase
     customer = browser_instance
     location(
       browser: customer,
-      url:     "#{browser_url}/assets/chat/znuny.html",
+      url:     "#{browser_url}/assets/chat/znuny.html?port=#{ENV['WS_PORT']}",
     )
     watch_for(
       browser: customer,
@@ -297,7 +297,7 @@ class ChatTest < TestCase
     customer = browser_instance
     location(
       browser: customer,
-      url:     "#{browser_url}/assets/chat/znuny.html",
+      url:     "#{browser_url}/assets/chat/znuny.html?port=#{ENV['WS_PORT']}",
     )
     watch_for(
       browser: customer,
@@ -387,7 +387,7 @@ class ChatTest < TestCase
     customer = browser_instance
     location(
       browser: customer,
-      url:     "#{browser_url}/assets/chat/znuny.html",
+      url:     "#{browser_url}/assets/chat/znuny.html?port=#{ENV['WS_PORT']}",
     )
     watch_for(
       browser: customer,