SAP JCO 2.1.6 – authorization problems

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With JCO version 1.1, I was able establish connection to SAP system with external java application. However, since I upgraded, using same user id, and SAP system, I receive error message: You are not authorized to logon to the target system (error code 1). com.sap.mw.jco.JCO$Exception: (103) RFC_ERROR_LOGON_FAILURE: You are not authorized to logon to the target system (error code 1).

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I meant to say that the authorization occurred when I upgraded JCO from 1.1 to 2.1.6. I have left my SAP system alone (not upgraded for a while)

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