# Proxy server - Automatic Configuration Script usage

**URL:** <https://community.postman.com/t/proxy-server-automatic-configuration-script-usage/1835>\
**Category:** Help Hub\
**Tags:** proxy, authentication\
**Created:** [June 8, 2018, 7:53pm UTC](https://community.postman.com/t/proxy-server-automatic-configuration-script-usage/1835 "2018-06-08T19:53:25Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![paulbveilleux](https://avatars.discourse-cdn.com/v4/letter/p/e36b37/32.png) [@paulbveilleux](https://community.postman.com/u/paulbveilleux)\
**Post date:** [June 8, 2018, 7:53pm UTC](https://community.postman.com/t/proxy-server-automatic-configuration-script-usage/1835/1 "2018-06-08T19:53:26Z")

</div>

In our Windows network configuration settings, we use “Automatic Configuration Scripts” that references a .dat file for our network proxy. Does Postman support this type of network proxy? I am getting “Could not get any response” error message in Postman when trying to access a SaaS application.

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<div class="post-metadata">

**Author:** ![Tzaphkiel](https://sea2.discourse-cdn.com/getpostman/user_avatar/community.postman.com/tzaphkiel/32/1292_2.png) [@Tzaphkiel](https://community.postman.com/u/Tzaphkiel)\
**Post date:** [February 6, 2019, 10:27am UTC](https://community.postman.com/t/proxy-server-automatic-configuration-script-usage/1835/2 "2019-02-06T10:27:21Z")

</div>

I am also interested in a spin-off of this questions whereby I can confirm that we have a similar setup with an automatic proxy configuration file that seems to be used when I click the “Use System Proxy” in the Postman settings but in my case I get a “407 Authorization required”.

Spin-off question: where/how can one configure the authentication (I believe that Postman does not support SSO mechanisms or NTLM for that matter)?

To be more precise, I get a response HTTP\_407 AuthRequir and the following headers that Postman does not seem to be able to handle (i.e.: go further and negotiate):

```auto
Response Headers:
Date:"Wed, 06 Feb 2019 10:28:47 GMT"
Content-Type:"text/html"
Cache-Control:"no-cache"
Content-Length:"1"
Proxy-Connection:"Keep-Alive"
Proxy-Authenticate:"Negotiate"

```