After changing the IP address of my Buffalo Linkstation LS-WVL/E (firmware 1.60) I was no longer able to log in as admin. I could login as a user, and I could read my files from the device, but I couldn't login as admin on the web admin page. I tried powering the unit down and I tried different browsers, but nothing worked.
Finally, I called tech support and they gave me the following solution:
The process resets the unit to get its IP address from the DHCP server and it resets the login to the default, which is User = "admin" and Password = "password." I was then able to log in to the unit as admin.
I should note, however, that after doing this procedure the username and password didn't work the first time I tried it. I had to try it twice to get it to go. This might have had something to do with the cache on my browser. When I tried it with a different browser, it worked the first time.
I hope this helps someone.
LF