Synology DSM 6.1 - Additional Domains for Existing Certificate


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My domain

I ran this command:?

It produced this output: ?

My operating system is (include version):SYNOLOGY DSM 6.1

My web server is (include version):Apache 2.4

My hosting provider, if applicable, is:myself

I can login to a root shell on my machine (yes or no, or I don’t know):I can

I’m using a control panel to manage my site (no, or provide the name and version of the control panel):DSM 6.1 control panel


hi @kaanpeker

Create a new certificate with all your domains and reinstall

You have not articulated how you obtained the certificate intially so that’s the best help I can offer.



thanks a lot!

I try to understand is there any limitation to create a cert for a specific domain and subdomains and then remove it from system for adding new subdomains to that particular domain ?

I use a web interface and dashboard for doing this on Synology DSM 6.1. The certification can automatically add and remove via this interface. I do not create or modify any configuration files.


and forgot to ask :slight_smile: what is the limit for subdomain number ?



The rate limits for new certificates are described at

You can get 100 names in a single certificate, but you can only get a limited number of separate new certificates per week that cover names within the same domain.


so what is the best and the rightest way to add new subdomains ( / to the existing certificate issued by Let’s Encrypt ? do I need to remove the certificate from my Synology Web Server and re-issue certificate with new extended subdomains ? or is there any way to add new subdomains to the cert without re-issuing certificate?


Certificates can only ever be changed by reissuing them, although some software typically hides this fact from the user.


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