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://learn.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.'.

which version of Microsoft.AspNetCore.SignalR are you using ? — Vivek Nuna, May 31 '18 at 12:50
Does your web server support WebSockets? Try disabling websockets to understand if that's the issue https://stackoverflow.com/questions/9994776/signalr-how-do-i-disable-websockets — Alper Ebicoglu, May 31 '18 at 13:04
yes, my server supports WebSockets, you can see my Sample Code for AspNetCore.SignalR works fine in my server — Lakin Lu, May 31 '18 at 23:58
Hi vivek nuna, my Sample chat Code for AspNetCore.SignalR works fine in my server, it may not be a firewall issue. — Lakin Lu, Jun 01 '18 at 00:01
In my case app crashed when mobile was running on 4G (WiFi was ok) and I was using HTTP only. After changing to HTTPS all was fine again. — Mariusz, Apr 18 '20 at 07:36

score 6 · Accepted Answer · answered Jun 01 '18 at 12:08

6

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.

answered Jun 01 '18 at 12:08

Lakin Lu

4,376
3
10
12

1

But one I still don't understand is, why I set HandshakeTimeout = TimeSpan.MaxValue, it works fine in VS but not in IIS. – Lakin Lu Jun 01 '18 at 12:09
Edit your question instead. – aaron Jun 03 '18 at 02:48

score 0 · Answer 2 · answered May 14 '21 at 09:31

0

The same here, but a bit different: I ran the server in Rider and everything worked. I put it in another directory and I've got handshake errors. Removing the handshake timeout and it works everywhere.

answered May 14 '21 at 09:31

Slesa

245
2
11

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

My Environment

Sample Code for AspNetCore.SignalR

Abp for AspNetCore.SignalR

2 Answers2