Synology DiskStation DS710+ root login fails after installing openssh

After installing openssh onto my DiskStation DS710+, I was unable to ssh in as root, even though I was able to ssh in as admin or any other user.

I found the result to be to telnet in as root (telnet is disabled by default, but can be enabled through the web console) - the normal password works fine through telnet - and once in, you can "change" the password by typing "passwd". I ensured that I set it to the same password as before.

Once you've done this, exit out of the telnet session, and try to ssh back in as root, and you should succeed.

Hope This Helps.