nopassword-Option with Informix OleDb

Hi, when using OleDB to access an informixdatabase, I can set an option "no password" which should allow me to access the db with only my username. Therefor there my hostname must be listet in my .rhost or in the /etc/hosts.equiv file. This works fine for me with f.i. the Borland BDE, but not with the OleDB-driver. With oledb I get an 952 (wrong password). Interersting is, that this "missed try" is not logged in the online.log of the server. When is try to access with a really wrong password, then the try is logged in online.log. It seems that the driver does'nt try to connect the server with my account, when I use the "no password"-option. Did anyone expect the same problem, or does anybody have a hint for me? Thanks in advance, Daniel