Hi,
Sometimes You can get “TNS-12641: Authentication service failed to initialize ” error.
Details of error are as follows.
TNS-12641: Authentication service failed to initialize
Cause: The authentication service failed during initialization.
Action: Enable tracing to determine the exact error.
The sqlnet.ora file that is local to the database ($ORACLE_HOME/NETWORK/ADMIN/sqlnet.ora) contained the following entry:
SQLNET.AUTHENTICATION_SERVICES=(ALL)
To solve this problem, change SQLNET.AUTHENTICATION_SERVICES=(ALL) or SQLNET.AUTHENTICATION_SERVICES= (NTS) parameter to SQLNET.AUTHENTICATION_SERVICES = (NONE) on sqlnet.ora under $ORACLE_HOME/NETWORK/ADMIN directory.
The old value is as follows.
SQLNET.AUTHENTICATION_SERVICES=(ALL)
The new value should be as follows.
SQLNET.AUTHENTICATION_SERVICES= (NONE)
Do you want to learn more details about RMAN, then read the following articles.
https://ittutorial.org/rman-backup-restore-and-recovery-tutorials-for-beginners-in-the-oracle-database/