"ACME client standalone challenge solver" message


I hit http://www.acessograduacao.ufrj.br/ and it returns the message “ACME client standalone challenge solver”.

Does anybody has an idea about it?

Thanks in advance.

Do you operate that website?

The ACME client Certbot includes a built-in web server. Usually, it only runs for a few seconds at a time, and it’s used to create certificates on computers that don’t already run web servers. (Like a mail server, for example.)

It sounds like your website is somehow running the web server from Certbot or maybe another ACME client. Maybe it was only for a few seconds? Maybe the page was cached? Maybe the subdomain is configured incorrectly?

If I access that web page, I get a 504 Gateway Timeout error from Nginx after 6 minutes.

Thanks for your reply.

I do not operate that website, I´m an user and the site may be busy or in maintenance.

Besides that, the message is curious and can´t be found on google.

Obrigado, André

Oi @acastanheira2001,

I think the system administrator was trying unsuccessfully to obtain a Let’s Encrypt certificate. Hopefully the administrator will come here to the forum to ask for help with this process so that the site can support HTTPS in the future. :slight_smile:

Right now, the site seems to be back up again but it doesn’t have a certificate and isn’t available via HTTPS.

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