# Prerequisites

RAS Management Portal can run in any modern web browser supporting HTML5 except for Internet Explorer.

Make sure your Windows Server has the following updates installed (RAS Management Portal depends on them):

* Windows Server 2012 R2: KB2999226

Newer versions of Windows Server do not require any specific updates.

The web service listens to web requests on the following ports by default:

* HTTPS: 20443
* HTTP: 20080


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# Agent Instructions: Querying This Documentation

If you need additional information that is not directly available in this page, you can query the documentation dynamically by asking a question.

Perform an HTTP GET request on the current page URL with the `ask` query parameter:

```
GET https://docs.parallels.com/landing/ras-admin-guide/parallels-ras-21-administrators-guide/parallels-ras-management-portal/prerequisites.md?ask=<question>
```

The question should be specific, self-contained, and written in natural language.
The response will contain a direct answer to the question and relevant excerpts and sources from the documentation.

Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.