ODBC InterBase 4.x Driver: "unavailable database" error ??

Hi All, Does someone know how to fix this please ( I'm trying to use an ODBC connection to Interbase 5) : I use : $c = odbc_connect( $alias, $user, $pw); I get the error message in the browser window : SQL error: [Visigenic][ODBC InterBase 4.x Driver][InterBase]unavailable database, SQL state S1000 in SQLConnect ... I'm on a WinNT Workstation, and test.gdb resides on a local NTFS drive E:/ I'm accessing the PHP3 file through Apache 1.3. having used ODBC Admin. to set up the alias TEST which successful connects on testing from here. I can access the database from a CMD interface (DOS window) using the file name (...test.gdb), also I can access through Control panel:ODBC Administrator: Test so the alias I am using is "registered" but "unavailable database"...??... How can I configure it to be available, please? Thanks for any help. :-) John