Database connection using sqlplus

Hi All,
Can someone please do explain why am getting different result with the following scenarios:
scenario 1
1. I installed a database server and created a user ops$user1 identified externally.
2. I created a unix user user1 (on the same machine) and make it member of oinstall and dba groups, set the environment variables the same as the oracle user.
3. I create a database user user2 identified by password2
4. Login as user1
5. run sqlplus /nolog
6. conn / <----- connection successful
7. conn user2/password2 <---- connection successful
scenario 2
1. I created instantclient group and user (nologin) with home directory at /opt/instantclient (perm 750).
2. I installed instantclient together with sqlplus and put it in /opt/instantclient.
3. I modified the group profile of user1 by removing oinstall and dba, member it to instantclient group.
4. set environment variables PATH, ORACLE_SID, LD_LIBRARY_PATH, CLASSPATH to include /opt/instantclient folder.
5. Login as user1
6. run sqlplus /nolog
7. conn / <----- got an error, it says ORA-12545: Connect failed because target host or object does not exist
8. conn user2/password2 <---- the same error
9. conn user2/password2@oracle_sid <-- successful
How come when using instantclient I need to supply the oracle sid? What we need is to connect using instantclient and need not to specify the oracle sid. Is this possible?
Many thanks for those who will reply.

Here it is:
SQL> show parameter authent
NAME_COL_PLUS_SHOW_PARAM
TYPE
VALUE_COL_PLUS_SHOW_PARAM
os_authent_prefix
string
ops$
remote_os_authent
boolean
FALSE

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People on the forum help others voluntarily, it's not their job.
Help them help you.
Learn how to ask questions first: http://faq.javaranch.com/java/HowToAskQuestionsOnJavaRanch
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