Buenas mi domio es karras.myqnapcloud.com
cuando intento renovar mi certificado me salta este error "Unknown error. Error code: -1."
I hope you can read English.
I think you need to ask QNAP support about that. It is not an error from Let's Encrypt.
I saw this on a QNAP forum. Does this help?
It is the same error message you report "unknown error. Error code: -1"
https://forum.qnap.com/viewtopic.php?t=175113
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