# Web browsers

| **Source**                                    | **Destination**                                | **Protocols** | **Ports** | **Description**                                                                                                                                                                                                |
| --------------------------------------------- | ---------------------------------------------- | ------------- | --------- | -------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |
| Web browser (HTML5) and Let's Encrypt service | RAS Web Admin Service \[RAS Management Portal] | TCP           | 20443     | Admin access to HTML5 based Management Portal of RAS environment                                                                                                                                               |
|                                               | HALB                                           | TCP           | 80, 443   | <p>End-user access to Parallels RAS Web Client (on Secure Gateway in Normal mode) through the HALB<br><strong>Note:</strong> Ports 80 and 443 must be open for incoming requests when using Let's Encrypt.</p> |
|                                               | RAS Secure Gateway                             | TCP           | 80, 443   | <p>End-user access to Parallels RAS Web Client (on Secure Gateway in Normal mode)<br><strong>Note:</strong> Ports 80 and 443 must be open for incoming requests when using Let's Encrypt.</p>                  |

{% hint style="info" %}
**Note:** Ports 80 and 443 must be open for incoming requests when using Let's Encrypt.
{% endhint %}