Synology, TLS-ALPN-01



i am using a Synology NAS with DSM 6.2.1 and a certificate from Let’s Encrypt. I got this message:

You need to update your ACME client to use an alternative validation
method (HTTP-01, DNS-01 or TLS-ALPN-01)

How can i do that?


This isn’t a good answer, but your Synology is using TLS-SNI-01 validation now, but should automatically switch to HTTP-01 or DNS-01 after Let’s Encrypt disables TLS-SNI-01.

I’m not sure if your version is new enough, or if you need to upgrade.

If, for example, it starts trying to use HTTP-01 validation but it fails because a firewall is blocking port 80, you will run into trouble. You should monitor its logs or make sure your certificate is successfully renewed over the next few months.


Its the newest DSM. Thanks for your answer, i will see if it works or not!