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Using ODAC 8.5.9 with XE3.
Suddenly, I can only connect with Oracle if I go into the Session Editor for TOraSession. I cannot connect if I run my application.
I am using Oracle 10g, with the Oracle 11g client, and using Windows authentication.
I have tried direct and tns connection, both give same result.

Ideas?

Hello,

Connection process is similar at both design-time and run-time, Therefore, if you can connect at design-time using OS Authentication, then connection must be established at run-time as well. Please make sure you are using one and the same SID, and that login and password are not set.

P.S. OS Authentication is not supported in the Direct mode