Cant connect my database using net service_name

Question

Good Morning to all;
I trying to connect my database using net service_name , but i am getting error.
I have tnsnames.ora entry and listener.ora entry.
Please help me to crack this error.
SQL> select name from v$database;
NAME
ORCLTEST
SQL> grant connect ,resource to u1 identified by u1;
Grant succeeded.
SQL> grant sysdba to u1;
Grant succeeded.
SQL> show parameter pass;
NAME TYPE VALUE
remote_login_passwordfile string EXCLUSIVE
SQL> shut immediate;
Database closed.
Database dismounted.
ORACLE instance shut down.
From DBS Directory :
[oracle@linuxserver dbs]$ orapwd file=orapworcltest password=asdf1234 entries=3
export ORACLE_SID=orcltest
[oracle@linuxserver ~]$ sqlplus /nolog
SQL*Plus: Release 10.2.0.1.0 - Production on Sat Mar 9 19:24:22 2013
Copyright (c) 1982, 2005, Oracle. All rights reserved.
ERROR when trying to connect
SQL> conn u1/u1@ORCLMYTEST
ERROR:
ORA-01034: ORACLE not available
ORA-27101: shared memory realm does not exist
Linux Error: 2: No such file or directory
SQL> conn u1/asdf1234@ORCLMYTEST
ERROR:
ORA-01034: ORACLE not available
ORA-27101: shared memory realm does not exist
Linux Error: 2: No such file or directory
Thanks in advance ..

Answer 1

Can i connect my database using username/password@netservice_name ?
Yes, you should. Please post the result of "lsnrctl stat LISTENER_ORCL".
*[oracle@linuxserver admin]$ lsnrctl stat LISTENER_ORCL*
LSNRCTL for Linux: Version 10.2.0.1.0 - Production on 09-MAR-2013 19:58:18
Copyright (c) 1991, 2005, Oracle. All rights reserved.
Connecting to (DESCRIPTION=(ADDRESS=(PROTOCOL=TCP)(HOST=linuxserver)(PORT=1521)))
STATUS of the LISTENER
Alias LISTener_ORcl
Version TNSLSNR for Linux: Version 10.2.0.1.0 - Production
Start Date 09-MAR-2013 11:10:14
Uptime 0 days 8 hr. 48 min. 3 sec
Trace Level off
Security ON: Local OS Authentication
SNMP OFF
Listener Parameter File /u01/app/oracle/product/10.2.0/db_1/network/admin/listener.ora
Listener Log File /u01/app/oracle/product/10.2.0/db_1/network/log/listener_orcl.log
Listening Endpoints Summary...
(DESCRIPTION=(ADDRESS=(PROTOCOL=tcp)(HOST=linuxserver)(PORT=1521)))
Services Summary...
Service "MYDB.PROD.ORCLPROD.COM" has 1 instance(s).
Instance "orclprod", status UNKNOWN, has 1 handler(s) for this service...
Service "MYDB.TEST.ORCLTEST.COM" has 1 instance(s).
Instance "orcltest", status UNKNOWN, has 1 handler(s) for this service...
Service "asdf" has 1 instance(s).
Instance "asdf", status READY, has 1 handler(s) for this service...
Service "asdfXDB" has 1 instance(s).
Instance "asdf", status READY, has 1 handler(s) for this service...
Service "asdf_XPT" has 1 instance(s).
Instance "asdf", status READY, has 1 handler(s) for this service...
Service "orclprod" has 1 instance(s).
Instance "orclprod", status READY, has 1 handler(s) for this service...
Service "orclprodXDB" has 1 instance(s).
Instance "orclprod", status READY, has 1 handler(s) for this service...
Service "orclprod_XPT" has 1 instance(s).
Instance "orclprod", status READY, has 1 handler(s) for this service...
Service "orcltest" has 1 instance(s).
Instance "orcltest", status READY, has 1 handler(s) for this service...
Service "orcltestXDB" has 1 instance(s).
Instance "orcltest", status READY, has 1 handler(s) for this service...
Service "orcltest_XPT" has 1 instance(s).
Instance "orcltest", status READY, has 1 handler(s) for this service...
The command completed successfully