Failed Connection to database from Putty . . .

Dears,,
I have Database UNIX server
and I can connect to the database through cmd command prompt ( sqlplus )
But when i connect to the UNIX server through Putty , it logged in to the UNIX operating system.
After logging to UNIX OS , i cannot connect to database through sqlplus ( failed )
and gave me ORA-12641: Authentication service failed to initialize
See the following . . .
login as: oracle
[email protected]'s password:
Last unsuccessful login: Tue Dec 28 14:56:02 CST 2010 on ssh from 172.16.50.54
Last login: Sun Mar 6 16:23:27 CST 2011 on /dev/pts/0 from x.x.x.x
db:/home/oracle>sqlplus user/pass@list
SQL*Plus: Release 10.2.0.4.0 - Production on Sun Mar 6 16:28:15 2011
Copyright (c) 1982, 2007, Oracle. All Rights Reserved.
ERROR:
ORA-12641: Authentication service failed to initialize
Enter user-name:
Please , help
Thanks & Regards,,

hello,
In the $ORACLE_HOME/network/admin/sqlnet.ora file SQLNET.AUTHENTICATION_SERVICES is set to ALL and Secure Network Services has not been used.
Issuing the connection from another computer rather than host will not produce the error because in that case secure network services will be used.
To disable SQL*Net authentication services while still allowing normal SQL*Net connections you can set in $ORACLE_HOME/network/admin/sqlnet.ora the following line,
SQLNET.AUTHENTICATION_SERVICES =(NONE)

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