Question

Certbot Error when trying to install MQTT on CentOS 7

When following the steps here

All works up to the end of Step2. Command sudo certbot certonly --standalone --standalone-supported-challenges http-01 -d mqtt.example.com where I replace example.com with my domain returns
certbot: error: unrecognized arguments: -standalone-supported-challenges http-01

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Bobby Iliev • September 18, 2019

Hello,

What is your certbot version? It seems like as of Certbot 0.33.0 which was released a couple of months ago and according to the official documentation, --standalone-supported-challenges had been deprecated for a long time and does the same thing as --preferred-challenges.

https://community.letsencrypt.org/t/certbot-0-33-0-release/90298/2

I’ll ask for the tutorial to be updated.

Let me know if this was the case. Regards, Bobby

mihai • September 18, 2019

Thank you for the quick answer. I asked a friend for help since this was above my pay grade. He used the command certbot certonly --preferred-challenges http -d mydomain.com and it worked. He says an update to the doc would be good. He also says that since there was already installed a listener on port 80, the --standalone option was not required. This could be specified in the doc also.