---
title: "App Settings: Local and Remote Backends"
product: "LumiScan Training"
component: "lumiscan-training"
version: "2.3.0"
display_version: "2.3.0.2"
latest_version: true
language: "en"
url: "https://docs.hdvisionsystems.com/en/lumiscan-training/2.3.0/app-settings.html"
---

# App Settings: Local and Remote Backends – LumiScan Training

By default, LumiScan Training starts its own backend on the same computer and requires no additional configuration.

The **App Settings** tab in the application navigation bar can also be used to configure a shared backend server. Other computers can then either access the frontend in a web browser or run their own LumiScan Training installation and connect it to the shared backend instead of starting a local backend.

## Setting Up a Shared Backend Server {#app-settings-server}

1. Install LumiScan Training on the computer that should act as the server, as described in [\[installing-lumiscan-training\]](https://docs.hdvisionsystems.com/en/lumiscan-training/2.3.0/app-settings.html#installing-lumiscan-training).

2. Start the application and open the **App Settings** tab.

3. Under **Backend connection**, make sure **Start backend locally** is enabled.

4. Under **Backend bind address**, select the network interface that other computers should use to access the server.

   Do not select `localhost (127.0.0.1)`, as this address only accepts connections from the same computer.

   Select the computer’s network IP address, for example `192.168.1.50`, or `0.0.0.0 (all interfaces)` to accept connections on all available network interfaces.

5. Enable **Autostart backend as a service**.

   This starts the backend automatically when the Windows user logs in, without opening the application window. The backend therefore remains available even if LumiScan Training itself is not open.

6. Click **Save**.

7. Restart LumiScan Training, or log out of Windows and log back in, for the changes to take effect.

> [!NOTE]
> Windows Firewall may ask whether the backend should be allowed to communicate over the network when it is first bound to a network-reachable address. Allow access for **Private networks** so that other computers can connect to the server.

## Connecting from a Client Computer {#app-settings-client}

There are two ways to connect another computer to the shared backend.

### Browser Access Without Installation

Open a web browser and navigate to:

`http://<server-ip>:8420`

Replace `<server-ip>` with the IP address of the server, for example:

`http://192.168.1.50:8420`

The full frontend runs in the browser, and no local installation of LumiScan Training is required.

### Installing LumiScan Training on the Client

1. Install LumiScan Training on the client computer, as described in [\[installing-lumiscan-training\]](https://docs.hdvisionsystems.com/en/lumiscan-training/2.3.0/app-settings.html#installing-lumiscan-training).
2. Start the application and open the **App Settings** tab.
3. Under **Backend connection**, disable **Start backend locally**.
4. Enter the server IP address, for example `192.168.1.50`, under **Remote backend address**.
5. Click **Save**.
6. Restart LumiScan Training.

The application now connects to the shared backend instead of starting a local backend.

## Troubleshooting {#app-settings-troubleshooting}

Problems with the shared backend are described step by step in [Troubleshooting](https://docs.hdvisionsystems.com/en/lumiscan-training/2.3.0/troubleshooting.html):

- [A client cannot connect to the shared backend](https://docs.hdvisionsystems.com/en/lumiscan-training/2.3.0/troubleshooting.html#faq-client-cannot-connect)