Connecting to SAP Oracle DB from External Oracle system

Question

Dear DB Gurus
I have to connect the Oracle server on my desktop system to the Oracle Database of my SAP DEV System. Both the Oracle versions are Oracle 9i. However hard I try, I end up with either Oracle error ORA 12541 - No Listener or ORA 12154 : TNS could not resolve service name. I have checked and listener is running on both the servers. Even have started it through lsnrctl start.
For reference, I am enclosing the respective file entries of bbot my server & SAP server.
tnsnames.ora file at my server
DEV.PIIL.COM =
  (DESCRIPTION =
    (ADDRESS_LIST =
      (ADDRESS = (PROTOCOL = TCP)(HOST = 192.XXX.X.XX)(PORT = 1521))
    (CONNECT_DATA =
      (SERVER = DEDICATED)
      (SERVICE_NAME = DEV.WORLD)
I presume that there might a problem with the domain name understanding as my machine is in domain A and the SAP Servers are out of domain or domain WORLD.
The tnsnames.ora file of the SAP server says
DEV.WORLD=
  (DESCRIPTION =
    (SDU = <sdu no.>)
    (ADDRESS_LIST =
        (ADDRESS =
          (COMMUNITY = SAP.WORLD)
          (PROTOCOL = TCP)
          (HOST = <hostname>)
          (PORT = <port>)
    (CONNECT_DATA =
       (SID = DEV)
       (GLOBAL_NAME = DEV.WORLD)
sqlnet. ora files  - at my server
NAMES.DEFAULT_DOMAIN = piil.com
SQLNET.AUTHENTICATION_SERVICES= (NONE)
NAMES.DIRECTORY_PATH= (TNSNAMES, ONAMES, HOSTNAME)
sqlnet. ora files  - at SAP server
AUTOMATIC_IPC = ON
TRACE_LEVEL_CLIENT = OFF
NAMES.DEFAULT_DOMAIN = WORLD
NAME.DEFAULT_ZONE = WORLD
SQLNET.EXPIRE_TIME = 0
TCP.NODELAY=YES
listener.ora file at my server
LISTENER =
  (DESCRIPTION_LIST =
    (DESCRIPTION =
      (ADDRESS_LIST =
        (ADDRESS = (PROTOCOL = IPC)(KEY = EXTPROC0))
      (ADDRESS_LIST =
        (ADDRESS = (PROTOCOL = TCP)(HOST = lokeshsvr)(PORT = 1521))
SID_LIST_LISTENER =
  (SID_LIST =
    (SID_DESC =
      (SID_NAME = PLSExtProc)
      (ORACLE_HOME = D:\oracle\ora92)
      (PROGRAM = extproc)
    (SID_DESC =
      (GLOBAL_DBNAME = OLG)
      (ORACLE_HOME = D:\oracle\ora92)
      (SID_NAME = OLG)
listener.ora file at SAP server
LISTENER =
  (ADDRESS_LIST =
        (ADDRESS =
          (PROTOCOL = IPC)
          (KEY = DEV.WORLD)
        (ADDRESS=
          (PROTOCOL = IPC)
          (KEY = DEV)
        (ADDRESS =
          (COMMUNITY = SAP.WORLD)
          (PROTOCOL = TCP)
          (HOST = <hostname>)
          (PORT = 1527)
STARTUP_WAIT_TIME_LISTENER = 0
CONNECT_TIMEOUT_LISTENER = 10
TRACE_LEVEL_LISTENER = OFF
SID_LIST_LISTENER =
  (SID_LIST =
    (SID_DESC =
      (SDU = <sduno>)
      (SID_NAME = DEV)
      (ORACLE_HOME = /oracle/DEV/920_64)
Any kind of help would be appreciable
Regards
Lokesh Gupta

Answer 1

The port number configuration was mismatched between my server and SAP Server due to which listener was not able to setup the connection.