# 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>                  |