Failed to establish a new connection: [Errno -3] Temporary failure in name resolution

[nexus9111]

Failed to establish a new connection: [Errno -3] Temporary failure in name resolution

[JonasAlfredsson]

Hi nexus9111,

The error message makes it look like the Let's Encrypt servers cannot resolve your domain name, is it publicly available and has it been given enough time to propagate out to the internet at large (24 hours are recommended for new domains).
What happens if you try to do a dig or nslooup of your domain name from a device that is on another network internet (like you phone with WiFi shut off, or a computer at work perhaps)?

[nexus9111]

Hi ! Thanks for quick answer

$ nslookup [domain]
Server:		89.2.0.1
Address:	89.2.0.1#53

Non-authoritative answer:
Name:	[domain]
Address: [my ip]

I made my dns recordings several days ago

[JonasAlfredsson]

What about the DNS lookup from within the container/VPS? Can that one resolve outside hostnames?
The message

Failed to establish a new connection: [Errno -3] Temporary failure in name resolution

points towards some kind of DNS problems.

[nexus9111]

From the container I got weird comportement: nslookup wasn't installed on the container si tried to apt update and got Temporary failure resolving 'deb.debian.org'. Found solution here. Just had to restart docker service and it works. Thanks for helping me !

[JonasAlfredsson]

Nice! Glad it was a simple fix :)