System.IO.EndOfStreamException: The header cannot be read from the data source.

Hello, I purchased a Unity Asset "SocketIO for Native and WebGL builds" that implements websocket-sharp few months ago for a game I am developing found at https://knor.io.

While you will notice that my WebGL Client Works perfectly fine connecting to my SSL Socket.io Game Server; When I try to connect to my server with SSL Enabled from Unity Editor or other Standalone Builds it fails to connect.

Here is the Error I am seeing:

|Fatal|WebSocket.connect|WebSocketSharp.WebSocketException: An exception has occurred while reading an HTTP request/response. ---> System.IO.EndOfStreamException: The header cannot be read from the data source.

If I used HTTP I can connect just fine from any platform, but the issue is I need to host my Socket.io Game Server over SSL. Right now I am using us-east.knor.io as URL and Port 443 with Ssl Enabled. Again it works perfect from WebGL Client, but from Unity Editor and Standalone it fails to connect. It's very strange. Any ideas on how to address this issue?

Your time will be greatly appreciated!

Start by reproducing the SSL connection from the Unity Editor or a standalone build against us-east.knor.io on port 443, then compare it with the working WebGL connection. Read the reported WebSocketException and EndOfStreamException while checking the HTTP request/response path. Done means identifying and resolving the platform-specific SSL connection failure, with a confirmed connection from the affected builds.