While you try to connect to database then most probably you will find the ORA-01017 error.
ORA-01017: Invalid Username/Password; Logon Denied
- Check if you have set up the right ORACLE_HOME and ORACLE_SID
- Check the entry for your tnsnames.ora and listener.ora file. there should not be any typo error.
- If you set SEC_CASE_SENSITIVE_LOGON parameter set to true then make sure to use correct case.
- Start the oracle services before you connect to database.
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