> ## Documentation Index
> Fetch the complete documentation index at: https://bruno-a6972042-tutor-mock-server.mintlify.site/llms.txt
> Use this file to discover all available pages before exploring further.

# Authenticate with NTLM

NTLM (NT LAN Manager) is a Microsoft authentication protocol used for Windows-based systems. Its challenge-response authentication mechanism is primarily used for:

* SharePoint
* Exchange
* Internal corporate APIs

Unlike basic authentication, which has a less secure protection layer, NTLM has multiple handshake steps and offers more robust security.

## NTLM in Bruno

Follow these steps to use NTLM authentication:

1. Open your request
2. Navigate to the **Auth** tab
3. Select **NTLM** from the dropdown list
4. Fill in the required fields:
   * **Username**: Your Windows username
   * **Password**: Your Windows password
   * **Domain**: Your Windows domain name

<img src="https://mintcdn.com/bruno-a6972042-tutor-mock-server/Jc_rhkgsDOD1EyDt/images/screenshots/auth/ntlm-auth.webp?fit=max&auto=format&n=Jc_rhkgsDOD1EyDt&q=85&s=8c74231409bad3c0e83d72511edc834e" alt="ntlm-auth" width="2468" height="936" data-path="images/screenshots/auth/ntlm-auth.webp" />