Problem connecting to the database from the PA profile window.
Invalid agent username and/or password.
If the "Use default agent authentication" checkbox is selected in the connection profile, clear it and supply a valid user identification.
The username in the PA connection window is not an Oracle username or schema user, it is a PA agent user used for interconnection. Unless you changed the default settings, you should just check the "Use default agent authentication". By default, it is using quest/quest as user/password.