Web Notifications and Progress UC requirements

Official Content
This documentation is valid for:

Both functionalities - Server.Socket external object, and Progress Indicator User Control - have the same requirements which are detailed below:

Client Requirements

  • Internet Explorer 10 or higher
  • Mozilla Firefox 7 or upper
  • Google Chrome 14 or upper
  • Safari 5
  • Safari for iOS 4.2.1

Web Server Requirements


In Java, the implementation is based on JSR 356, Java API for WebSocket.


  • Java 8
  • Java EE 8–compliant application server (minimum required: Tomcat 8)
  • Servlet server running on JVM 1.8

.NET Framework 

Software requirements:

  • IIS8 or higher (Window 8 or higher / Windows Server 2012 or higher)
  • .NET Framework 4.5 or higher


  • IIS8 'WebSocket' module installed. To install this module for Windows, do the following:
  • In the control panel, click the Windows button
  • Type: Turn windows features on or off
  • Navigate to: Internet Information Services > world Wide Web services > Application Development Features
  • Select “Websocket Protocol” and OK


  • .Net implementation uses the following assemblies

    - Microsoft.WebSockets.dll
    - GXWebSocket.dll

Configuration requirements:

  • "Compiler Path" .NET Generator property set to use .NET Framework v4.0 (typically under "C:\Windows\Microsoft.NET\Framework\v4.0.30319\csc.exe")
  • Application Pool in IIS must be configured for running with .NET Framework v4.0
  • IIS Version Property = IIS8.
  • The web application must be Smooth (full ajax), that is Version Property "Web User Experience = Smooth



1. Verify File "CloudServices.config" is present in the Deployment. This File MUST exist. 

2. Verify web.config:

<httpRuntime requestValidationMode="2.0" targetFramework="4.5" />

//The Following Lines must NOT be present:

    <remove assembly="GXWebSocket" />
    <remove assembly="Microsoft.WebSockets" />

3. If you compile with framework 2.0, run on ASP.net 2.x, you may get this:

FileLoadException: Could not load file or assembly 'log4net, Version=, Culture=neutral, PublicKeyToken=669e0ddf0bb1aa2a' or one of its dependencies.
The located assembly's manifest definition does not match the assembly reference. (Exception from HRESULT: 0x80131040)
SuperSocket.SocketBase.Logging.Log4NetLogFactory..ctor(String log4netConfig) +0

Solution: Apply Requirements


4. If you haven't the Web Socket Protocol installed you see the following error (or similar) in the web console:

Firefox can’t establish a connection to the server at


5. If you have Tomcat connected with Apache, one possible solution to make the Web Notifications work is the following:

Define these entries in the Apache configuration file:

  • ProxyPass /<webapp name>/gxwebsocket ws://<webapp name>/gxwebsocket
  • ProxyPassReverse /<webapp name>/gxwebsocket ws://<webapp name>/gxwebsocket

Then enable the proxy_wstunnel module in Apache.



  • .Net Environment (Windows 10 Server) does not support more than 10 webSocket simultaneous connections . 
Windows 10      IIS v10.0
Home:           No IIS *We Think*
Pro:            simultaneous request execution limit of 10, allows multiple sites *We Think*
Enterprise:     simultaneous request execution limit of 10, allows multiple sites *We Think*
Education:      unknown at this time
IoT Core:       unknown at this time