Replace Certificate in Synology NAS

Fill up info

Following steps can be used to replace certificate (not renew) in Synology NAS user interface.

• Go to Control Panel -> Security -> Certificate
• Select Add -> Add
• Select Replace an existing certificate
• Choose the certificate to be replaced
• Select Get a certificate from Let's Encrypt
• Fill up info, includes domain, email, alias (seperated by semi-colons)

Change port forwarding

Now, make sure Synology NAS can be accessed from internet via port forwarding at port 80 and 443 if required.

Suggest using A * record in DNS entry to avoid DNS change. Use NGINX to redirect traffic to this host.

Generate

Then generate certificate.