Synology / Let's Encrypt certificate - Failed to connect to Let's Encrypt. Please make sure the domain is correct

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Hi @xsc

first step: Check, if there is an update.

There are some problems with DSM -> update -> the problem is gone.

Last topic:

I just updated to latest available DSM version (DSM 6.2.2-24922 Update 4) and now it works fine

PS: Checking your domain via https://check-your-website.server-daten.de/?q=xsc.cloud there are older checks, 4 hours old. There is no older certificate with that domain name, so it's your first certificate.

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