> For the complete documentation index, see [llms.txt](https://docs.parallels.com/landing/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.parallels.com/landing/ras-admin-guide/v21-en-us/parallels-ras-21-administrators-guide/parallels-ras-apis/ras-rest-api/installation.md).

# Installation

To enable RAS REST API in a RAS Farm, you need to install the RAS Web Administration Service. It can be installed on the RAS Connection Broker server or any other server. If you install the service on a separate server, you will need to change its configuration (after the installation) to point to RAS Connection Broker. By default, the configuration points to "localhost".

{% hint style="info" %}
**Note:** If you've already configured and are using Parallels RAS Management Portal, you may skip this step because you should already have the RAS Web Administration Service installed.
{% endhint %}

To install RAS Web Administration Service:

1. Run the Parallels RAS installer on the RAS Connection Broker or any other server.
2. On the **Select Installation Type** page, select **Custom**.
3. On the next page, select to install the **Parallels RAS Web Administration Service** component.
4. Click **Next** and follow the onscreen instructions.

### **Configure RAS Web Administration Service**

If the RAS Web Administration Service was installed on a separate server, you need to modify its configuration and specify the RAS Connection Broker server address. You may also want to change the port number and certificate information in the same configuration file. The configuration of the RAS Web Administration Service is saved as a JSON file at the following location:

**C:\Program Files (x86)\Parallels\ApplicationServer\WebAdminService\appsettings.json**

When modifying the service configuration, please note the following:

* In the configuration JSON file, the RAS Connection Broker address is specified using the "LicenseServer" parameter.
* The default HTTPS port number is set to `20443`. This number is chosen not to conflict with RAS Secure Gateway ports. You can change it to `443` (if this does not conflict), so when opening the portal, you don't have to include the port in the URL.


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