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@Balazs Papp is right. My case was in a ONE NODE RAC environment, I could not connect to NODE1 with sqlplus sys/password@tnsalias as sysdba from NODE2. It was because I had changed the password of sys from NODE1, but the orapw$ORACLE_SID file in NODE2 kept the old password. So I copied the orapw$ORACLE_SID from NODE1 to NODE2, and the problem got solved.

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