Failure to login

When i tried to log in all the accounts i have using sql plus it give me the following error
Error Ora-12560: TNS: protocol adapter error
any help would be appreciated
tesmis

And here is what I simulated the error you are getting (gave a wrong value for the environment variable ORACLE_SID), you might probably be doing the same:-
C:\>set ORACLE_SID=BABU22
C:\>sqlplus / as sysdba
SQL*Plus: Release 10.2.0.1.0 - Production on Tue Dec 12 10:17:32 2006
Copyright (c) 1982, 2005, Oracle.  All rights reserved.
ERROR:
ORA-12560: TNS:protocol adapter error
Enter user-name:
ERROR:
ORA-12560: TNS:protocol adapter error
Enter user-name:
ERROR:
ORA-12560: TNS:protocol adapter error
SP2-0157: unable to CONNECT to ORACLE after 3 attempts, exiting SQL*Plus***************** + *****************
Also check your other duplicate thread for some additional info:-
Re: failure to login

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