# Calling Web API using windows(NTLM) authentication

**URL:** <https://forum.inductiveautomation.com/t/calling-web-api-using-windows-ntlm-authentication/90365>\
**Category:** General Discussion\
**Tags:** ignition81, scripting, perspective\
**Created:** [May 14, 2024, 2:42pm UTC](https://forum.inductiveautomation.com/t/calling-web-api-using-windows-ntlm-authentication/90365 "2024-05-14T14:42:24Z")\
**Posts on this page:** 1\
**Showing post:** 2

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**Author:** ![Kevin.Herron](https://sea1.discourse-cdn.com/inductiveautomation/user_avatar/forum.inductiveautomation.com/kevin.herron/32/7259_2.png) [@Kevin.Herron](https://forum.inductiveautomation.com/u/Kevin.Herron)\
**Post date:** [May 14, 2024, 2:49pm UTC](https://forum.inductiveautomation.com/t/calling-web-api-using-windows-ntlm-authentication/90365/2 "2024-05-14T14:49:30Z")

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There's no support for NTLM authentication in either the old `system.net` functions or the newer `system.net.httpClient` functions. You won't be able to call this API if that's the only authentication mechanism supported.

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