> ## Documentation Index
> Fetch the complete documentation index at: https://bruno-a6972042-docs-clustered-top-nav-v2.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-docs-clustered-top-nav-v2/nHmm23hYxQNodt98/v2/images/screenshots/auth/ntlm-auth.webp?fit=max&auto=format&n=nHmm23hYxQNodt98&q=85&s=524bf85811a4d5be1fcdaabd30879968" alt="ntlm-auth" width="3024" height="1520" data-path="v2/images/screenshots/auth/ntlm-auth.webp" />