> ## Documentation Index
> Fetch the complete documentation index at: https://docs.pads4.com/llms.txt
> Use this file to discover all available pages before exploring further.

# Install a PADS4 Sub Server

The installation process matches the PADS4 Server setup. See [Install PADS4 Server](/install-pads4/install-pads4-server/Install-the-PADS4-server) and run the installer.

## Configuring a Sub Server

To configure a Sub Server, complete the following steps in PADS4 System Management on the Main Server:​

1. Open **PADS4 System Management** on the Main Server.
2. In the left menu, select **Servers**.​
3. In the ribbon bar, click **Add Sub Server**.
4. Enter a **display name** for the Sub Server as it should appear in PADS4.
5. Verify that a **valid license** is assigned to the Sub Server.

## Network Port Configuration

PADS4 uses specific network ports for its internal communication and services. Refer to the [**Network Ports Configuration** ](/network-requirements)page for the full list of required ports and settings.

For more details on how data is synchronized between Main, Sub, and Backup Servers, see the [**Replication with Sub and Backup Servers**](/network-requirements) page.

## Server installation requirements

<Warning>
  Do not install **PADS4 Foundation** on a workstation or Viewer PC. It must run on a dedicated **server machine**.
</Warning>