LetsEncrypt Challenge failed for domain

Running this with my domain:

sudo certbot certonly --standalone --preferred-challenges http --server --register-unsafely-without-email -d example.com Saving debug log to /var/log/letsencrypt/letsencrypt.log Plugins selected: Authenticator standalone, Installer None Obtaining a new certificate Performing the following challenges: http-01 challenge for example.com Waiting for verification... Challenge failed for domain example.com http-01 challenge for example.com Cleaning up challenges Some challenges have failed. IMPORTANT NOTES: - The following errors were reported by the server: Domain: exxample.com Type: connection Detail: correct.ip.address: Fetching Timeout during connect (likely firewall problem) To fix these errors, please make sure that your domain name was entered correctly and the DNS A/AAAA record(s) for that domain contain(s) the right IP address. Additionally, please check that your computer has a publicly routable IP address and that no firewalls are preventing the server from communicating with the client. If you're using the webroot plugin, you should also verify that you are serving files from the webroot path you provided. 

Note: Without using --standalone I am able to download the file wget

I have port forward working correct and in the Ubuntu server I did ufw 80 and ufw 443. But still note, that I am able to wget the file manually.

I have ipv4 records, but no AAAA ipv6 records - but I guess it should work with ipv4.

And I have no problem serving pyton3 -m http.server 80 and curl to the server.

Am I missing something?

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