# Letsencrypt "Already Registered!" errors

**URL:** https://discourse.roots.io/t/letsencrypt-already-registered-errors/6318
**Category:** trellis
**Created:** 2016-03-29T05:04:23Z
**Posts:** 5
**Showing post:** 4 of 5

## Post 4 by @grantnorwood — 2016-03-31T05:43:23Z

Potentially a compatibility issue with CloudFlare?

A good discussion about constraints and potentially having to purchase a paid plan from CloudFlare to use other authority’s certificates [exists on another thread](https://community.letsencrypt.org/t/will-a-certificate-from-lets-encrypt-work-with-cloudflare-incapsula/411/2?u=grantnorwood).

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_[View the full topic](https://discourse.roots.io/t/letsencrypt-already-registered-errors/6318)._