This is an old post but I thought is better to write here rather than make a new for the same issue.
So, after I came back to work after vacations I try to connect on the DNS-320 to check that backup is working properly as is schedule. Trying to connect as an admin failed. I don't know why. I am sure that I was using the correct password, but nothing.
Anyway, I also try to connect as a user to check my files, and other users file and thank God all files are fine.
I also try to reset the admin password with telnet (putty and fun_plug) but it won't change, or maybe it won't store the password. I don't know.
Finally, since it won't lose any data if I manually reset the devise (from the small button behind the DNS-320) I remove the power, hold the reset and then power on again while holding the reset for more than 5 sec. It didn't work either.
So, did I did the reset procedure wrong ? Can you guys explain me what can I do to reset that password?