---
title: How to download and interpret diagnostic logs
description: A diagnostic log file captures historical information about a device's operation. It is important to download the diagnostic file before rebooting or power-cycling a device as part of troubleshooting. Rebooting or power-cycling will clear the log file history.
---

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# How to download and interpret diagnostic logs

A diagnostic log file captures historical information about a device's operation. It is important to download the diagnostic file before rebooting or power-cycling a device as part of troubleshooting. Rebooting or power-cycling will clear the log file history.

**Follow these steps to download a diagnostic file for connected devices from the WebUI:** 

1. Access the WebUI of the D621. In your browser's address bar, type:
   
   **https://*hostname***
   
   where *hostname* is the hostname (KB-XX-XX-XX) or IP address of the radio. See [Connecting to the AltoPlex radio](https://support.altowav.com/connect-to-the-altoreach-device.html#h3) for more information.
2. Click the **login** link in the WebUI header to log in as administrator. The default password is **admin**.
   
   ![](https://support.altowav.com/hs-fs/hubfs/kb-images/altoplex-radios/WebUI-login-link-with-wireless-tab_b61c241c.png?width=670&height=99&name=WebUI-login-link-with-wireless-tab_b61c241c.png)
3. Click on the **Admin** tab.
4. Click on the **Download Diagnostic File** button in the **Device control** section.
   
   ![](https://support.altowav.com/hs-fs/hubfs/kb-images/altoplex-radios/WebUI-D621-Admin-tab_download-diagnostic-file_bd758fbc.png?width=1118&height=382&name=WebUI-D621-Admin-tab_download-diagnostic-file_bd758fbc.png)
5. The file is sent to your system's default download location. The file name includes the host name (KB MAC) of the device and the date. For example, KB-C7-00-01\_diag\_2025-11-07-20-32-26.txt
6. Zip the file and attach it to an email to [support@altowav.com](mailto:support@altowav.com?subject=Issue%20with%20Diagnostic%20file%20attached.%20) or a ticket at [support.altowav.com](https://support.altowav.com?hsLang=en-us).

**Create a diagnostic file from the REST API**

1. Use the admin/diagdump API to create a diagnostic file from the REST API. For example, use the curl command to save the diagnostic information to a file named diag\_dump, created in the current directory: 
   
   **curl -k -o diag\_file.txt -u admin:\<*password*\> https://\<*hostname*\>/rest/v002/admin/diagdump** 
   
   *where*:
   
     - *password* is the password to log into the device. The default password is **admin**.
     - *hostname* is the hostname or IP address of the device.
2. Zip the file and attach it to an email to [support@altowav.com](mailto:support@altowav.com?subject=Issue%20with%20Diagnostic%20file%20attached.%20) or the ticket at [support.altowav.com](https://support.altowav.com?hsLang=en-us).

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