I installed firebird database for the first time in my life (version 1.5.6 on Windows 7), after installation I can not connect to the sample database (employee.fdb exists), or create a database. This gives the following error in ISQL Tool:
C:\Program Files\Firebird\Firebird_1_5\bin>isql
Use CONNECT or CREATE DATABASE to specify a database
SQL> CONNECT "C:\Program Files\Firebird\Firebird_1_5\examples\employee.fdb"
CON> user 'SYSDBA' password 'masterkey';
Statement failed, SQLCODE = -904
unavailable database
SQL> create database 'C:\test.fdb'
CON> user 'SYSDBA' password 'masterkey';
Statement failed, SQLCODE = -904
unavailable database