Login from client always face ORA-01017: invalid username/password; logon denied.
After examine what kind of error, i found that 11g defaulted using this parameter:
SQL> show parameter sec_case_sensitive_logon
NAME TYPE VALUE
------------------------------ ----------- ------------------------------
sec_case_sensitive_logon boolean TRUE
So, i try to change the parameter to :
SQL> alter system set SEC_CASE_SENSITIVE_LOGON=false scope=both;Than i try to connect again and successful.
System altered.