Can somebody tell me what is difference between
1. sqlplus system/manager@DELPHI
2. sqlplus < Hit Enter > Key in Login name & Password.
First one connect fine ! But second one gives error ORA-12545.
Trying to connect from client unix box to oracel instance.
What i have checked so far :
1. Host name is correct !
2. DNS settings are okay !
3. ORACLE_SID & ORACLE_HOME are correct.