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Get error ```gaierror(-2, 'Name or service not known'))``` from certbot

i try to get SSL cert for my site and i am using certbot certonly -a webroot --webroot-path=/var/www/html -d example.com -d www.example.com but get such error raise ConnectionError(err, request=request) ConnectionError: ('Connection aborted.', gaierror(-2, 'Name or service not known')) , my OS is Debian 8 and i am using nginx and node js on my server, tnks 在此处输入图像描述

I ran into this error today. Seems to have fixed itself.

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