Authenticate with Windows NTLM authentication in Postman

Windows NTLM is the authorization flow for the Windows operating system and for standalone systems. NTLM is a challenge-response style authentication protocol.

To use NTLM authentication, do the following:

1. In the Authorization tab for a request, select NTLM Authentication from the Auth Type dropdown list.

2. Enter your Username and Password for NTLM access. You can optionally set advanced details, but Postman will try to generate values for them if necessary.

By default, your request will run a second time after extracting data received from the first request. You can turn off this behavior by selecting the Yes, disable retrying the request checkbox.

Advanced parameters for NTLM auth are as follows:

• Domain - The domain or host to authenticate against.
• Workstation - The hostname of your PC.