LE Certificate on Synology NAS - no connection possible

I have problems receiving a LE certificate for my domain - see details below.

Please fill out the fields below so we can help you better. Note: you must provide your domain name to get help. Domain names for issued certificates are all made public in Certificate Transparency logs (e.g. crt.sh | example.com), so withholding your domain name here does not increase secrecy, but only makes it harder for us to provide help.

My domain is: nextcloud.spiesmenschen.de

I ran this command: no command, try to get LE certificate using Synology onboard tools

It produced this output: "Connection to LE could not be established. Make sure the domain name is valid."

My web server is (include version): Apache HTTP Server 2.4

The operating system my web server runs on is (include version): Synology

My hosting provider, if applicable, is: n/a

I can login to a root shell on my machine (yes or no, or I don't know): n/a

I'm using a control panel to manage my site (no, or provide the name and version of the control panel): Synology

The version of my client is (e.g. output of certbot --version or certbot-auto --version if you're using Certbot):

Hi @Ben1

that's an unspecific error.

Checking your domain that can't work. http redirects to port 5000.

Letsencrypt follows such redirects - but only port 80 or port 443, nothing else.

Remove that redirect or remove it, if the path starts with /.well-known/acme-challenge.

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