On a specific machine TOracleSession.LogOn fails. No EOracleError is fired but Sysutils.Exception. The Exception.Message is '.' Same Logon with a program that is not a Service succeeds. (Same OS user, db user, etc.) My problem is the stupid error message (.) I am not able to locate the error this way. My compiler is BCB5, DOA version is 4.0.6.2

My guess is that the message comes from an Oracle Net DLL. Maybe the PATH is different in these 2 situations?