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

# nTop Allowlisting Guide

This article reviews the allowlisting guidelines for connecting to cloud licensing, accessing nTop web resources, and receiving important email communications.

nTop is a standalone application that operates locally on your desktop. However, we connect to cloud services for license authentication and account management. Some organizations may require [configuring additional proxy settings](https://support.ntopology.com/hc/en-us/articles/360048560934).

## **Connecting to nTop for Cloud Licensing**

Following is a list of URLs to allowlist:

## For version 4.2 and newer

| **URL**                                                   | **Reason**                                                    |
| --------------------------------------------------------- | ------------------------------------------------------------- |
| [https://updater.ntop.com/](https://updater.ntop.com/)    | For automatic software updates                                |
| [https://analytics.ntop.com/](https://analytics.ntop.com) | For sharing product usage data                                |
| [https://crashes.ntop.com/](https://crashes.ntop.com)     | Crash reports for product improvements                        |
| [https://app.ntop.com/](https://app.ntop.com)             | For downloading software and accessing the customer dashboard |

##

## For version 4.1 and older

| **URL**                                                                                                                           | **Reason**                                                                      |
| --------------------------------------------------------------------------------------------------------------------------------- | ------------------------------------------------------------------------------- |
| [https://license.ntopology.com/](https://license.ntopology.com) and [https://license.ntop.com/](https://license.ntop.com)         | For license verification from desktop software \[Only for nTop 2.18.5 or older] |
| [https://updater.ntopology.com/](https://updater.ntopology.com/) and [https://updater.ntop.com/](https://updater.ntop.com/)       | For automatic software updates                                                  |
| [https://analytics.ntopology.com/](https://analytics.ntopology.com) and [https://analytics.ntop.com/](https://analytics.ntop.com) | For sharing product usage data                                                  |
| [https://crashes.ntopology.com/](https://crashes.ntopology.com) and [https://crashes.ntop.com/](https://crashes.ntop.com)         | Crash reports for product improvements                                          |
| [https://app.ntopology.com/](https://app.ntop.com) and [https://app.ntop.com/](https://app.ntop.com)                              | For downloading software and accessing the customer dashboard                   |

**Additional information:**

port: 443

Request header: Boost.Beast

## **Web Resources and Email Communication**

Following is a list of websites to allowlist and e-mails to add to your trusted senders list to access helpful resources and receive important communications from us:

| Website/Email                                        | **Reason**                                                                    |
| ---------------------------------------------------- | ----------------------------------------------------------------------------- |
| [https://ntop.com](https://ntop.com)                 | Our main website                                                              |
| [https://app.ntop.com](https://app.ntop.com)         | For downloading software and accessing the customer dashboard                 |
| [https://support.ntop.com](https://support.ntop.com) | To access nTop Help Center                                                    |
| [https://learn.ntop.com](https://learn.ntop.com)     | To access nTop Learning Center                                                |
| [no-reply@ntop.com](mailto:no-reply@ntop.com)        | To receive emails from nTop for account activation and license information    |
| [engineering@ntop.com](mailto:engineering@ntop.com)  | To ensure you're receiving our Product Newsletter and other important updates |

Contact [support@ntop.com](mailto:support@ntop.com) if you need help connecting to the license server after updating or not receiving emails from us. We can help you revert to an older version and work with your IT to solve the issue.

## Keywords:

*licensing cloud account list firewall allow allowlist*