WebSocket failed to connect and tried many ways but still got the problem

My error:

"WebSocket failed to connect. The connection could not be found on the server, either the endpoint may not be a SignalR endpoint, the connection ID is not present on the server, or there is a proxy blocking WebSockets. If you have multiple servers check that sticky sessions are enabled"

I got this problem although i still can connect to server without warning in console log on the website but the error always appears in my terminal when i ran the programme.

My Angular code:

public connect(): void {
this.hubConnection = new signalR.HubConnectionBuilder()
.withUrl(this.webSockeUrl, {
transport: signalR.HttpTransportType.WebSockets,
skipNegotiation:true,
accessTokenFactory: () => { return this.token!},
})
.withAutomaticReconnect()
.build();

this.hubConnection
.start()
.then(() => console.log("Connection started"))
.catch(err => console.error("Error establishing connection: ", err));
}

public addReceiveMessageListener(): void {
this.hubConnection.on("ReceiveMessage", (message: string) => {
console.log("Receive Message from server:", message);
});

this.hubConnection.on("ReceivePrivateMessage", (message: string) => {
console.log("Receive Message from another client:", message);
});
}


And i still received message from another client through connectionId with this code and authorized normally in Asp.net:

[Authorize]
public class ChatHub : Hub
{
public async Task SendMessage(string connectionId, string message)
{
await Clients.Client(connectionId).SendAsync("ReceivePrivateMessage", message);
}

public override async Task OnConnectedAsync()
{
var connectionId = Context.ConnectionId;
await Clients.All.SendAsync("ReceiveMessage", $"{connectionId} has joined");
}
}


if i remove skipNegotiation i got negotiation with server incomplete, i also tried add my server port is 44398 to inbound rules of firewall and tried turn window feature "WebSocket protocol" in control panel on. I read many articles involve with this problem and tried but i still can not fix it does not appear in my terminal.

Thanks for help!

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