# Problem with new Certificate

**URL:** <https://community.letsencrypt.org/t/problem-with-new-certificate/18808>\
**Category:** Help\
**Created:** [August 10, 2016, 11:51am UTC](https://community.letsencrypt.org/t/problem-with-new-certificate/18808 "2016-08-10T11:51:18Z")\
**Posts on this page:** 4\
**Page:** 1

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**Author:** ![eXe-88](https://avatars.discourse-cdn.com/v4/letter/e/a88e57/32.png) [@eXe-88](https://community.letsencrypt.org/u/eXe-88)\
**Post date:** [August 10, 2016, 11:51am UTC](https://community.letsencrypt.org/t/problem-with-new-certificate/18808/1 "2016-08-10T11:51:18Z")

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Hey Guys,

i have a problem to get a new certificate.

i used the command ./certbot-auto -d [www.mydomain.de](http://www.mydomain.de)

and i get the following message:  
IMPORTANT NOTES:

- The following errors were reported by the server:

How can I delete [myotherdomain.de](http://myotherdomain.de)?

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**Author:** ![tialaramex](https://avatars.discourse-cdn.com/v4/letter/t/f08c70/32.png) [@tialaramex](https://community.letsencrypt.org/u/tialaramex)\
**Post date:** [August 10, 2016, 1:20pm UTC](https://community.letsencrypt.org/t/problem-with-new-certificate/18808/2 "2016-08-10T13:20:23Z")

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Let’s Encrypt is trying to perform a Domain Validation challenge called TLS-SNI-01

It connects to your HTTPS server, and says it wants to talk to a server with this unlikely looking name ending in .acme.invalid, it does this as part of the challenge.

Your HTTPS server has no idea what this is about, and responds with a default of some certificate you already had. It won’t help you to “delete” this other certificate. To pass the challenge your server would need to give the correct answer, giving no answer at all, or a different wrong answer won’t help.

Is this an Apache web server?

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<div class="post-metadata">

**Author:** ![eXe-88](https://avatars.discourse-cdn.com/v4/letter/e/a88e57/32.png) [@eXe-88](https://community.letsencrypt.org/u/eXe-88)\
**Post date:** [August 10, 2016, 1:38pm UTC](https://community.letsencrypt.org/t/problem-with-new-certificate/18808/3 "2016-08-10T13:38:46Z")

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yes it is apache server

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**Author:** ![system](https://global.discourse-cdn.com/letsencrypt/original/3X/c/a/ca6c06ea1ea201324bba7048c6841ce60236468d.png) [@system](https://community.letsencrypt.org/u/system)\
**Post date:** [September 9, 2016, 1:38pm UTC](https://community.letsencrypt.org/t/problem-with-new-certificate/18808/4 "2016-09-09T13:38:45Z")

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