Cannot connect local database using net service_name

Question

Good Morning to all ;
FYI : This  question wrongly posted under high availability. Now it was removed from there.
I am trying to connect my local database  using remote authentication.
but getting error. Client & Server reside on same  server.
SQL> conn u1/u1@primdb
ERROR: ORA-12545: Connect failed because target host or object does not exist
SQL> conn / as sysdba
Connected.
SQL> show parameter db_name;
NAME                                 TYPE        VALUE
db_name                              string      primary
SQL> show parameter service_names;
NAME                                 TYPE        VALUE
service_names                        string      mydb
SQL> show parameter db_domain;
NAME                                 TYPE        VALUE
db_domain                            string      primary.com
SQL> show parameter global_name;
NAME                                 TYPE        VALUE
global_names                         boolean     FALSE
SQL> select * from global_name;
GLOBAL_NAME
PRIMARY
[oracle@localhost admin]$ lsnrctl start
LSNRCTL for Linux: Version 10.2.0.1.0 - Production on 18-JAN-2014 16:32:08
Copyright (c) 1991, 2005, Oracle.  All rights reserved.
Starting /u01/app/oracle/product/10.2.0/db_1/bin/tnslsnr: please wait...
TNSLSNR for Linux: Version 10.2.0.1.0 - Production
System parameter file is /u01/app/oracle/product/10.2.0/db_1/network/admin/listener.ora
Log messages written to /u01/app/oracle/product/10.2.0/db_1/network/log/listener.log
Error listening on: (DESCRIPTION=(ADDRESS=(PROTOCOL=TCP)(HOST=oel5.linuxserver)(PORT=1521)))
TNS-12545: Connect failed because target host or object does not exist
TNS-12560: TNS:protocol adapter error
TNS-00515: Connect failed because target host or object does not exist
Listener failed to start. See the error message(s) above...
my listener.ora file contents :
SID_LIST_LISTENER =
  (SID_LIST =
    (SID_DESC =
      (SID_NAME = primary)
      (ORACLE_HOME = /u01/app/oracle/product/10.2.0/db_1)
      (GLOBAL_DBNAME = mydb.primary.com)
LISTENER =
  (DESCRIPTION_LIST =
    (DESCRIPTION =
      (ADDRESS = (PROTOCOL = TCP)(HOST = oel5.linuxserver)(PORT = 1521))
      (ADDRESS = (PROTOCOL = IPC)(KEY = EXTPROC0))
my tnsnames.ora contents
primdb= 
  (DESCRIPTION =
    (ADDRESS_LIST =
      (ADDRESS = (PROTOCOL = TCP)(HOST= oel5.linuxserver)(PORT=1521))
    (CONNECT_DATA =
      (SERVER=DEDICATED)
      (SERVICE_NAME = mydb)
$ tnsping primdb
TNS Ping Utility for Linux: Version 10.2.0.1.0 - Production on 18-JAN-2014 16:40:55
Copyright (c) 1997, 2005, Oracle.  All rights reserved.
Used parameter files:
Used TNSNAMES adapter to resolve the alias
Attempting to contact (DESCRIPTION = (ADDRESS_LIST = (ADDRESS = (PROTOCOL = TCP)(HOST= oel5.linuxserver)(PORT=1521))) (CONNECT_DATA = (SERVER=DEDICATED) (SERVICE_NAME = mydb)))
TNS-12545: Connect failed because target host or object does not exist
Thanks in advance ..

Answer 1

Good Morning  Ed Stevens ;
Nice to see you once again !
I remember , you are very familiar with  oracle net services.
I read your article. Exploring the LOCAL_LISTENER parameter
Now i have removed listener.ora & tnsnames.ora files .
now the listener is registered as dynamically'
SQL> alter system register;
Ed Stevens wrote ..
simply do a  "ping oel5.linuxserver"  and report the result.
$ ping  oel5.linuxserver
ping: unknown host oel5.linuxserver
$ hostname
localhost.localdomain
$ echo $ORACLE_HOSTNAME
oel5.linuxserver
my new tnsnames.ora contents
primdb = 
  (DESCRIPTION =
    (ADDRESS_LIST =
      (ADDRESS = (PROTOCOL = TCP)(HOST = oel5.linuxserver)(PORT=1521))
    (CONNECT_DATA =
      (SERVER = DEDICATED)
      (SERVICE_NAME = mydb)
$ tnsping primdb
TNS Ping Utility for Linux: Version 10.2.0.1.0 - Production on 18-JAN-2014 19:57:13
Copyright (c) 1997, 2005, Oracle.  All rights reserved.
Used parameter files:
Used TNSNAMES adapter to resolve the alias
Attempting to contact (DESCRIPTION = (ADDRESS_LIST = (ADDRESS = (PROTOCOL = TCP)(HOST = oel5.linuxserver)(PORT=1521)))
(CONNECT_DATA = (SERVER = DEDICATED) (SERVICE_NAME = mydb)))
TNS-12545: Connect failed because target host or object does not exist