interbase connectivity problem in delphi 4 C/S

    we write a project using d4 c/s. when we write a ISAPI dll which connect
to an interbase 5.6 database, this exception occurs:

>>  Exception: EDBEngineError

Message: Unknown user name or password. unavailable database Alias: BARAN <<

when we dynamicaly create database and queries component nothing changed.

we connect to database through ODBC!

Please help!