// create an instance of WebSocket client
var client = new WebSocketClient();

// connect to a server

// send a text message

// receive a text message
string response = client.Receive();
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Rebex WebSocket is a WebSocket client library for .NET. It brings TLS 1.2, 1.1, SHA-2, SNI, AES/GCM and other modern security-related features to legacy platforms. It is designed to offer an easy-to-use API in addition to the advanced .NET ClientWebSocket API.

Why Rebex WebSocket?

Multiplatform WebSocket client

WebSockets are becoming increasingly popular, but support in .NET is far from perfect. Versions of .NET prior to 4.5 don't support WebSockets at all, and even .NET 4.5 only supports WebSockets on Windows 8 or higher.

Rebex WebSocket supports legacy platforms (including .NET Framework 2.0/3.5 and .NET Compact Framework 3.5/3.9) and works on legacy operating systems (Windows Vista, Windows XP SP3, Windows Mobile 5/6, Windows CE, Pocket PC, Windows Embedded Compact). Of course, modern platforms such as .NET Core are supported as well.

TLS 1.2 and SHA-2 certificates - even on Windows XP and Windows CE

Rebex WebSocket implements the following modern TLS features on all supported platforms:

  • TLS 1.2, 1.1, 1.0
  • Elliptic Curve DSA and Elliptic Curve Diffie-Hellman ciphers
    (requires plugin on some platforms)
  • AES/GCM ciphers
  • SHA-2 certificates
  • SHA-2 hashing algorithms
  • Server Name Indication (SNI) extension
  • Renegotiation Indication extension
  • Support for legacy SSL 3.0 protocol
And more...


.NET Framework


.NET Core

1.x, 2.x, 3.0


4.x, 5.x


Xamarin.iOS 10.3 or later


Xamarin.Android 8.0 or later

Legacy platforms

.NET Compact Framework

3.5, 3.9

Learn more about supported standards and platforms.