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My domain is:cloudrop.co
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.
Andrei
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 
what is the limit for subdomain number ?
BEST
The rate limits for new certificates are described at
https://letsencrypt.org/docs/rate-limits/
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 (a1.example.com / a2.example.com) 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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