DL3 server is asking for a password?

I have 4 DL3's that I need to load content on to. These units are subrented. When I drop the content into the folder, a window pops up asking for a user name and password. The default name is administrator. I have tried the usual passwords. I have a call in to the lighting house that we rented them from but, no word yet.
Has anybody seen this before? Is this something the last user set up?
Please help.
Bud
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