When your Synology won’t (or more likely can’t because you blocked port 80 after getting the first time) automatically renew its Let’s Encrypt SSL certificate you can manually trigger the renewal yourself.
If you’re using Windows 10, you could also use the new built in SSH client which seems to work fine.
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| ssh user@synology.local | |
| sudo -i | |
| # Method 1 | |
| /usr/syno/sbin/syno-letsencrypt renew-all | |
| # Method 2 – Verbose | |
| /usr/syno/sbin/syno-letsencrypt renew-all -vv |