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+2  Q: 

ORA-12638 Credential retrieval failed and ORA-01031: insufficient privileges

in sqlnet.ora file:

when i have SQLNET.AUTHENTICATION_SERVICES= (NTS)

i can't connect by PL/SQL developer arises "ORA-12638 Credential retrieval failed" ,but can connect by command line

when i have SQLNET.AUTHENTICATION_SERVICES= (NONE)

i can't connect 

>sqlplus / as sysdba

arises "ORA-01031: insufficient privileges"

,but can connect by PL/SQL developer and command line when i supply username and password

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