# Error 20 at 1 depth lookup

**URL:** <https://community.letsencrypt.org/t/error-20-at-1-depth-lookup/14644>\
**Category:** Server\
**Created:** [April 20, 2016, 6:43pm UTC](https://community.letsencrypt.org/t/error-20-at-1-depth-lookup/14644 "2016-04-20T18:43:54Z")\
**Posts on this page:** 1\
**Showing post:** 5

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**Author:** ![schoen](https://sea3.discourse-cdn.com/letsencrypt/user_avatar/community.letsencrypt.org/schoen/32/79_2.png) [@schoen](https://community.letsencrypt.org/u/schoen)\
**Post date:** [April 21, 2016, 6:39pm UTC](https://community.letsencrypt.org/t/error-20-at-1-depth-lookup/14644/5 "2016-04-21T18:39:23Z")

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Is it possible that the module has hard-coded the old Let's Encrypt Authority X1 intermediate certificate and is not aware of the new Let's Encrypt Authority X3 certificate?

This issue is described in the 5th paragraph of @jsha's post at

> [@Upcoming intermediate changes](https://community.letsencrypt.org/t/upcoming-intermediate-changes/13106):
>
> W…

If the module author did not take account of this, that could produce the kind of problem that you describe.

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