No solvers available for remaining challenges

Hi,

i want to host boringproxy on my Oracle VPS but i am getting the following error:

user@server:/mnt/fatdrive/boringproxy$ ./boringproxy-linux-arm64 server -admin-domain internal.domain.org -acme-email "myemail@mailserver.com" -accept-ca-terms -print-login -acme-use-staging
2024/09/26 20:56:52 Starting up
WARNING: Failed to access <ipv6 address>:80 from the internet
WARNING: Failed to access <ipv6 address>:443 from the internet
2024/09/26 20:56:52 Automatic agreement to CA terms with email (myemail@mailserver.com)
2024/09/26 20:56:58 internal.domain.org: obtaining certificate: [internal.domain.org] Obtain: [internal.domain.org] solving challenges: internal.domain.org: no solvers available for remaining challenges (configured=[tls-alpn-01 http-01] offered=[dns-01 tls-alpn-01 http-01] remaining=[dns-01]) (order=https://acme-staging-v02.api.letsencrypt.org/acme/order/red/acted) (ca=https://acme-staging-v02.api.letsencrypt.org/directory)

i can see that it says something about failed to access but the oracle server does not have ipv6 enabled as far as i know and should only have a public ipv4 address.

Quick update before posting: the server actually had ipv6 enabled but no dns records pointing to the ipv6 address. i added the dns records for everything but its still not working and gives the same error. i am using cloudflare as dns provider.

ports 80 and 443 are open in the subnet security list and also the servers firewall because im already hosting a website there using cloudpanel (great tool btw). letsencrypt certificate creation for sites created with cloudpanel also works fine so i really dont know what the problem could be