Jun 07, 2019 07:46 AM|Brando ZWZ|LINK
According to your description, I suggest you could set the connection timeout value in Application_Start in your Global.asax file.
More details, you could refer to below codes:
protected void Application_Start(object sender, EventArgs e)
// Make long polling connections wait a maximum of 110 seconds for a
// response. When that time expires, trigger a timeout command and
// make the client reconnect.
GlobalHost.Configuration.ConnectionTimeout = TimeSpan.FromSeconds(110);
// Wait a maximum of 30 seconds after a transport connection is lost
// before raising the Disconnected event to terminate the SignalR connection.
GlobalHost.Configuration.DisconnectTimeout = TimeSpan.FromSeconds(30);
// For transports other than long polling, send a keepalive packet every
// 10 seconds.
// This value must be no more than 1/3 of the DisconnectTimeout value.
GlobalHost.Configuration.KeepAlive = TimeSpan.FromSeconds(10);