/signalr/hubs 404 not found after update to MVC5

Question

SignalR was working while project was ASP.NET MVC3. Now i upgraded it to MVC5 (not so easy to do, I must tell you).

Then I noticed that signalR was not working. I we

Answer 1

Like Milos said, clearing temp folder will probably fix the problem. I have created a script for doing this which I call powerreset.cmd which should be run As Administrator:

@echo off
@iisreset /stop
@robocopy e:\empty "C:\Windows\Microsoft.NET\Framework\v4.0.30319\Temporary ASP.NET Files" /PURGE
@robocopy e:\empty "C:\Windows\Microsoft.NET\Framework64\v4.0.30319\Temporary ASP.NET Files" /PURGE
@iisreset /start

The e:\empty folder, which will be the source, and using purge with robocopy should then clear the temp files.

Answer 2

The SignalR js versions are supposed to be the same, but can be different. As a side effect you will find that error in browser console.

Check the version of SignalR library in Scripts folder and the one referenced in your view.

• ~/Scripts/jquery.signalR-2.1.0.min.js (SignalR tutorial);
• jquery.signalR-2.2.1.min.js is installed into scripts folder (nuget installation: install-package Microsoft.AspNet.SignalR).

Sometimes the most evident things are left unnoticed.

Answer 3

You need to install Microsoft.Owin.Host.SystemWeb package in the project

Verify this link

If package is not installed then install the following package from the Package Manager Console (PMC):

Install-Package Microsoft.Owin.Host.SystemWeb

UPDATE

It purely says that, its not able to detect your startup class, here are few more findings.

• I believe this key is no more exist in config file <add key="owin:AutomaticAppStartup" value="false" />
• Your application might be cached in temp folder, try deleting temporary files for your application.(Go to run > %TEMP% > CTRL + A > Delete)

This should definitely work, if it doesn't then try creating signalR in sample project.