I have one database of my own, not a client's, on a server of my own, and for some reason, holding down OPTION on my Mac keyboard does not present the log-in dialog. Other databases on my Mac allow me to force the login dialog to open, so it's not a problem with OS-X or my keyboard. The same database on a different Mac computer behaves normally. All this suggests to me that the password is stored in my Keychain.
I've searched the Keychain but can't find it by the database name or IP address. The Keychain utility has several ways of storing passwords, and i've searched them all, at least I think I have.
Any suggestions would be appreciated. How can I force the login dialog to re-appear?