Database Administration (MOSC)

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Can't connect as sysdba

edited Jan 28, 2025 3:56PM in Database Administration (MOSC) 4 commentsAnswered

When attempting to connect using SQL*Plus, the SYSTEM user connects successfully, but when using the SYS user with AS SYSDBA, the error "ORA-01017: Invalid username/password; logon denied" occurs. Additionally, after entering sqlplus /nolog, running CONN / AS SYSDBA results in the error "ORA-12560: TNS: Protocol adapter error."

Could you explain the possible causes and how to successfully connect with the SYS user?

Windows 2019 (64bit)

19.14.0

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