Letsencrypt in DSM6: The operation failed

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Has anyone been able to get Letsencrypt working on DSM6?


Whenever I try to request a new certificate I get the following error: "The operation failed. Please log in to DSM again and retry".

I intend to use a subdomain, so set the domain name to the sub-domain, the email to my email adress and leave the subject alternative name blank.



2017-04-23T16:13:04+02:00 server synoscgi_SYNO.Core.Certificate.LetsEncrypt_1_create[30687]: certificate.cpp:957 syno-letsencrypt failed. 1 [syno-letsencrypt output is not a json: { "error": 102, "msg": "Invalid response from "

404 Not Found

Not Found



Edit: I managed to request a certificate by routing port 80 to my NAS. However... when going to ip:5001 it still says that the connection is not secure...

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When lets encrypt issue you certificate you need to switch to that certificate. By default there is synology certificate issued.


Go to Certificates->Configure and chose new certificate for your domain/service.

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