This was reported by Tsutomu Hayashi in fb-devel
With DatabaseAccess = None in firebird.conf, test = c:\database\test.fdb in aliases.conf and missing file c:\database\test.fdb, running in isql:
create database 'test';
throws an error:
Statement failed, SQLCODE = 28000
Access to database "C:\DATABASE\TEST.FDB" is denied by server administrator
-I/O error for file "test"