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Can't reach the server from domain in local network

aq flag

First of all I want to create an email server for myself. I did almost everything in here (https://www.linuxbabe.com/mail-server/ubuntu-20-04-iredmail-server-installation) but when I try to set the cert this error show up: (Challenge failed for domain mail.medux.hu http-01 challenge for mail.medux.hu Cleaning up challenges Some challenges have failed.

IMPORTANT NOTES:

I asked my DNS provieder about that, but they said everything is fine. Also tried this: (https://www.linuxbabe.com/mail-server/enable-smtps-port-465-postfix) and also checked my firewall settings but it seems fine. If I enter the domain name on the server, everything works fine, but if I try to open that on another computer which is also connected to the same network it says "The requested URL / was not found on this server" but this is the really same url. If I write the server's IP address it works fine. Is there something that could help?

Paul avatar
cn flag
It appears you have a webserver configuration issue some place. However, there is not enough information about your configuration to resolve the issue. You need to post your server configuration for help with troubleshooting. Also, did you follow instructions 'Failure to Obtain TLS Certificate'?
aq flag
@Paul Okay, so which configuration should I post? Also I checked the part which you mentioned but I don't even had to change that because it was the same as default somehow. After that I tried the same "sudo certbot certonly --webroot --agree-tos --email [email protected] -d mail.medux.hu -w /var/www/html" but there was an error of course: "Invalid response, to fix these errors, please make sure that your domain was entered correctly and the DNS A/AAAA record(s) for that domain."
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