The security package we had problems with is named "StandGuard". It's a very good security program, I'm sure, but its default settings get in the way of normal activity at times.
Look at the registered exit points on the machine (WRKREGINF). I'm not overly familiar with these, but a number of them were put in place especially for the security guys like Townsend or Powerlock to add security features to the machine. One or more provide a way to do extra checking when a user validation is attempted. The program called may behave differently from a Telnet(5250) login than from a database connection.
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