# How Letsencrypt work for windows IIS?

**URL:** <https://community.letsencrypt.org/t/how-letsencrypt-work-for-windows-iis/2106>\
**Category:** Uncategorized\
**Created:** [October 25, 2015, 10:24am UTC](https://community.letsencrypt.org/t/how-letsencrypt-work-for-windows-iis/2106 "2015-10-25T10:24:59Z")\
**Posts on this page:** 1\
**Showing post:** 91

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**Author:** ![pfg](https://sea3.discourse-cdn.com/letsencrypt/user_avatar/community.letsencrypt.org/pfg/32/1924_2.png) [@pfg](https://community.letsencrypt.org/u/pfg)\
**Post date:** [April 27, 2016, 11:40pm UTC](https://community.letsencrypt.org/t/how-letsencrypt-work-for-windows-iis/2106/91 "2016-04-27T23:40:10Z")

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You're probably running into a problem with IIS serving the wrong intermediate certificate. Try one of the following fixes:

> [@IIS 8.5 building incorrect chain with Lets Encrypt Authority X3](https://community.letsencrypt.org/t/iis-8-5-building-incorrect-chain-with-lets-encrypt-authority-x3/13320/78):
>
> I…

> [@IIS 8.5 building incorrect chain with Lets Encrypt Authority X3](https://community.letsencrypt.org/t/iis-8-5-building-incorrect-chain-with-lets-encrypt-authority-x3/13320/84):
>
> A…

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