ASP.NET CORE 2.1 Server timeout while debugging

Thanks to @Arhire Ionut

Here is how to increase Javascript client timeout

hubConnection.serverTimeoutInMilliseconds = 100000; // 100 second

More details here => https://github.com/aspnet/Docs/issues/6885

What @MahmoudFarhat mentioned in another answer is correct. But also take a look at this link and then read my comments below.

If signalR got disconnected, you should try re-establishing the connection again. The connection could drop for several other reasons, including the user switching networks. For example if the user is using a cell-phone and connected to the home/office Wifi but steps out which then connects to cellular data connection.

To reconnect you could use the following (works like a charm for me):

// re-establish the connection if connection dropped
connection.onclose(() => setTimeout(startSignalRConnection(connection), 5000));

where startSignalRConnection is :

const startSignalRConnection = connection => connection.start()
  .then(() => console.info('Websocket Connection Established'))
  .catch(err => console.error('SignalR Connection Error: ', err));

and connection is

const connection = new HubConnectionBuilder()
  .withUrl(connectionHub, options)
  .withHubProtocol(protocol)
  .build();