Authenticate with Windows NTLM authentication in Postman

Windows Challenge/Response (NTLM) is the authorization flow for the Windows operating system and for standalone systems.

To use NTLM authentication, do the following:

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

  2. Enter your Username and Password for NTLM access (use variables to avoid entering the values directly). You can optionally specify advanced parameters, but Postman will try to autocomplete these if necessary. By default your request will run a second time after extracting data received from the first. You can turn off this behavior by selecting the checkbox.

Advanced parameters for NTLM auth are as follows:

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

Last modified: 2022/12/12