I've been getting above error since yesterday when I'm debugging my MVC webapp locally via VS 2019. The error comes from the negotiate request which is something like below:
http://localhost:53652/signalr/negotiate?clientProtocol=2.1&connectionData=x
I've deployed it to one of our Dev servers in Azure cloud, and now that too getting the same error and SignalR is not workable. However, SignalR is still working fine in our Production servers.
I've followed this: https://github.com/Azure/azure-signalr/issues/909
And this: https://forums.asp.net/t/2154631.aspx?Error+500+using+Azure+SignalR+service
But still no use. After enabling diagnostics as per the first link, I was getting an error saying that I cannot connect to our Azure SignalR instance. But I don't get it since, the production servers can connect and working fine.
I was in Azure SignalR v1.2.3, and later updated to v1.4.3 thinking that would resolve. But still no luck.
Any help will be highly appreciated. Thank you.