In case something goes wrong, Synology has supplied an easy way to, not restore, but create a set of new and working certificates. This should restore the certificates if importing certificates from the web manager has failed. If you need a telnet or ssh client use PuTTY.
Login as root, using the admin users password, to the Synology NAS drive using telnet or ssh. And type the following in the command prompt:
Code: Select all
cd /usr/syno/etc/ssl/
./mkcert.sh
In a while the NAS drive should have rebooted, and everything should be fine again.