Hi Synametrics Support,

How are you? I solved my own problem.

The reason why I couldn't create a Let's Encrypt certificate was that the QNAP unit was seizing port 80 by default.

I stopped the Xeams server, then ran the Port Query windows utility which reported the following on the QNAP local IP address:

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Starting portqry.exe -n 192.168.xxx.xxx -e 80 -p TCP ...

Querying target system called:

192.168.xxx.xxx

Attempting to resolve IP address to a name...

IP address resolved to NAS1

querying...

TCP port 80 (http service): LISTENING
portqry.exe -n 192.168.xxx.xxx -e 80 -p TCP exits with return code 0x00000000.

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This is when I realised that the QNAP was grabbing the port.

I then enabled the web server app and changed the port to something like 80xx, not default port 80.

This stopped QNAP from grabbing port 80 and the webserver was on a different port which didn't interfere with Xeams.

When I then tried to create the Let's encrypt SSL certificate I got the following message:

Let's Encrypt certificate has been configured and you should be able to access the web interface using https: //mail.domain.com. Your current certificate is valid until Apr 21, 2023

Success!

To access the QNAP I had to create a shortcut to access it as http: //xxx.xxx.xxx.xxx:8080

Best regards