Failed connection handshake error when using AspNetCore.SignalR in ABP under IIS

Question

My Environment

• .NetCore SDk - 2.1.300
• Microsoft.AspNetCore.SignalR - 1.0.0
• IIS - Version 10.0.12393.0 in Window Server 2016

Sample Code for AspNetCore.SignalR

• I follow the instructions by link https://docs.microsoft.com/en-us/aspnet/core/signalr/get-started?view=aspnetcore-2.1&tabs=visual-studio to complete a sample AspNetCore.SignalR chat code.
• I can run it successfully in Visual Studio.
• After that, I publish it to my server (window server 2016, IIS has websocket feature), and it also works fine. That means, my server environment support AspNetCore.SignalR well.

Abp for AspNetCore.SignalR

• I download the ABP template code from ABP website
• Upgrade the .net core sdk to .net core 2.1
• Upgrade nuget packages
• Follow my above steps to add sample AspNetCore.SignalR chat code in the project.
• Run it successfully in visual studio

The issue is, when I publish it to the server (same as my above server), and run it, it throws a error - AspNetCore.SignalR.HubConnectionContext - Failed connection handshake.

I have research it, but didn't get any solution. could you please help to look at it what the issue is?

I have push my project into github: https://github.com/lcyhjx/AbpExample, you can pull and run it (Just run AbpExample.Web.Host). It works fine in Visual Studio, but failed in IIS.

The error detail:

• Information: Normalizing '/chatHub' to 'http://localhost:6011/chatHub'.
• Information: WebSocket connected to ws://localhost:6011/chatHub?id=2zix_nPHODwLEv2p_4VCAw'
• Error: Connection disconnected with error 'Error: Server returned handshake error: An unexpected error occurred during connection handshake.'.

Answer 1

I have addressed the issue. It's a code issue, in my code I have set

HandshakeTimeout = TimeSpan.MaxValue;

If I comment above code, then all works fine in both VS and IIS.