After too many failed attempts to login, Oracle locks the protect user account.
This can happen during install or during a password change.
Oracle Protect account locked.
Oracle Alert log: “ORA-28000: the account is locked"
IncidentPersister0.log Or MonitorController0.log: ORA-01017: invalid username/password; logon denied.
When the error “ORA-28000: the account is locked” displays, there are two ways to unlock the Oracle database account:
To unlock the Oracle account:
To unlock the Oracle account from the command line using SQL*Plus:
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This will clear the history and restart the chat.