Azure SignalR Error: (429) Too Many Requests

Question

I am using Azure SignalR with Asp.Net MVC API (with .net framework not .net core) project. I can never connect to Azure's SignalR service (tried any possible configuration) while everything works fine when signalr is self-hosted.

As I enable CLR exceptions (under Exception Settings pane by checking everything under Common Language Runtime Exceptions) I keep getting the two following errors:

1. System.Net.WebException: 'The remote server returned an error: (429) Too Many Requests.'

2. System.Net.WebSockets.WebSocketException: 'Unable to connect to the remote server'. Inner Exception WebException: The remote server returned an error: (429) Too Many Requests.

I am using SignalR Free tier but also tried with Standard tier and ended up with the same results.

I keep checking "Connection (max)" graph under "Overview" tab on Azure portal and observing "Server 20, client 0" all the time.

The first time I got the error I assumed I really tried connecting too many times and reached maximum connection/attempt and gave up trying. After some time (approximately 24 hours) I only tried three times and still getting the same exception (429 - too many requests).

This is my configuration (in Startup.cs):

app.MapAzureSignalR(
                "/signalr",
                GetType().FullName,
                new HubConfiguration
                {
                    // tried all combinations of boolean values below.
                    EnableDetailedErrors = true,
                    EnableJSONP = true,
                    EnableJavaScriptProxies = true
                }, options =>
                {
                    options.ConnectionCount = 5; // tried increasing and decreasing that number.
                    options.ConnectionString = "<my connection string from azure portal signalr service>";
                    options.AccessTokenLifetime = TimeSpan.FromDays(1); // tried even removing.
                }
            );

This code runs on my local machine, not on Azure's AppService. However, it won't run on AppService either. Because it is easier to debug on local machine, I have been trying on local machine.

I searched on the internet but have not found anything related to my issue.

How do I solve the problem?

EDIT: I have the following packages installed.

<package id="Microsoft.AspNet.SignalR" version="2.4.1" targetFramework="net472" />
<package id="Microsoft.AspNet.SignalR.Core" version="2.4.1" targetFramework="net472" />
<package id="Microsoft.AspNet.SignalR.JS" version="2.4.1" targetFramework="net472" />

Answer 1

Edited:

How many hubs defined in your server-side? The server connection count for AspNet SignalR is (hub count + 1) * options.ConnectionCount

---

For Free instances, there are 2 dimensions of limits:

1. Concurrent connection count <= 20
2. Total message count sent per day <= 20K (refreshed every day at 12:00am UTC time).

There is no message limit for Standard tiers.

Here is the pricing detail for Azure SignalR Service. Here explains in detail how messages and connections are calculated.