# Cannot Request a new Certificate

**URL:** <https://community.letsencrypt.org/t/cannot-request-a-new-certificate/240204>\
**Category:** Help\
**Created:** [August 8, 2025, 8:10pm UTC](https://community.letsencrypt.org/t/cannot-request-a-new-certificate/240204 "2025-08-08T20:10:23Z")\
**Posts on this page:** 1\
**Showing post:** 3

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**Author:** ![r0bc94](https://sea3.discourse-cdn.com/letsencrypt/user_avatar/community.letsencrypt.org/r0bc94/32/88522_2.png) [@r0bc94](https://community.letsencrypt.org/u/r0bc94)\
**Post date:** [August 9, 2025, 12:30pm UTC](https://community.letsencrypt.org/t/cannot-request-a-new-certificate/240204/3 "2025-08-09T12:30:48Z")

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Hi @MikeMcQ ,

thank you for your reply. [feste-ip.net](http://feste-ip.net) is a mapping service since I only have a public ipv6 address and a natted ipv4. So requests coming from ipv4 only hosts are mapped to ipv6 by this servcie.

I supposed that they changed something because in the past, they where transparent to the acme challenge. I guess I need to ask the named service if they changed something in regards to acme challenges.

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_[View the full topic](https://community.letsencrypt.org/t/cannot-request-a-new-certificate/240204)._