Certbot error on ubuntu server 16.04 lts

here my error

IMPORTANT NOTES:

the dns is correct and the hostname of the server is ok

someone can help me?

thanks

The http requests are not being forwarded to your web server.
They are being handled directly by the router:

Thanks for the reply ,let me forward 443 port correctly and i will let you know !

Bye

You will probably need to forward port 80 here, because that’s the port that the initial validation attempt arrives on.

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