I cannot seem to be able to find the correct & definitive syntax to
issue for a CONNECT to a database. Sometimes it works, sometimes it
tells me that my username & password does not exists and I do not
understand why:

I do the following: (under Win*)
ISQL <enter>
connect 'c:\db\mydb.fdb' USER sysdba PASSWORD masterkey;

I have tried surrouding sysdba & masterkey with single & double quotes,

I have tried the syntax from the command line
-user sysdba -password masterkey 'c:\db\mydb.fdb'

The database exists, the username & password do work fine ... when
using IBOconsole for example ... I am lost for words (and ideas :( )

Thanks in advance for your answer(s)

Didier