> Both via localhost or local protocol it comes the same error.
>
> Where can I find a sample .exe (and a .fdb) which access firebird to
> test on my system?
>

Did you try to install any third-party firebird tools and try to
access your database ?
By the way - do you use events in your database and listen for them in
your client application?

Best regards,
Pavel Kutakov
SQLLY Development.
InterBase/Firebird Development Studio - complete development solution.
http://www.sqlly.com