Oracle

ORA-12638: Credential retrieval failed

1) Go to /oracle home/network/admin and open sqlnet.ora

2) Search for  SQLNET.AUTHENTICATION_SERVICES= (NTS) and change it to
SQLNET.AUTHENTICATION_SERVICES= (NONE)

3) Save the file and try to connect via sqlplus

/oracle home/bin/sqlplus sys/sys as sysdba

sql>startup force;

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