Certificat error

Hi guys,
i'm not able to get certificat from my Voip phone server , . any idea?

Challenge is invalid! (Status: invalid). Details: urn:ietf:params:acme:error:unauthorized - Invalid response from http://mycompagnydomainxxx/.well-known/acme-challenge/dsqdsdqsdVTBecwsqdqsdsdqsdsqsdsd [1xx.xx.xx.xx]: .


Usually, when someone opens a thread in the #Help section, they are presented with a questionnaire. Maybe you didn't get it or you deleted it. In any case, those questions and more importantly, the answers are crucial to help you. So please answer all the questions of the questionnaire below to the best of your knowledge. If you don't know the answer, please specify that in stead of leaving the answer open.

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. crt.sh | 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):


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