Learning use of Let's Encrypt

I am a newbie as far as setup of SSL certificates.

Our two website been using Let's E certificate for the last 2 years. The hosting company did all the setups and renewals. The latest renewal failed and they are no longer provide support.

here is the error we are getting:
Validation of the required challenges did not complete successfully. Invalid response from https://www.xxxxxxxxxxxxxxxxxxxx.com/.well-known/acme-challenge/_SGhPZfv8TGNy1X46bc_aV5vjFyLUCXSznj5BbazVC8 []: "\n\n404 Not Found\n\n

Not Found


Where do I go and how do I learn all that needs to be known about Let's Encrypt certificate usage?

any help here would be appreciated

1 Like

Welcome to the Let's Encrypt Community, Aron :slightly_smiling_face:

We're glad you're here and more than happy to help you out. There should have been a form presented to you when you first created your topic. I'll repost it here for you to copy-and-paste and fill out as best you can. If you don't know all of the answers, no worries, just do the best you can.

Please fill out the fields below so we can help you better. Note: you must provide your domain name to get help. Domain names for issued certificates are all made public in Certificate Transparency logs (e.g. https://crt.sh/?q=example.com), so withholding your domain name here does not increase secrecy, but only makes it harder for us to provide help.

My domain is:

I ran this command:

It produced this output:

My web server is (include version):

The operating system my web server runs on is (include version):

My hosting provider, if applicable, is:

I can login to a root shell on my machine (yes or no, or I don't know):

I'm using a control panel to manage my site (no, or provide the name and version of the control panel):

The version of my client is (e.g. output of certbot --version or certbot-auto --version if you're using Certbot):

Here's a little reading material for you: :slightly_smiling_face:


thanks for getting back to me

let me study the link you sent me

will reach out if needed after

You're very welcome. :blush:

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