Oracle 11G on Linux - DB2 Gateway problem

Could you please post your gateway listener.ora file, your tnsnames.ora file located in the Oracle database and  the listener status of the gateway listener (lsnrctl status <gateway listener name>)

tnsping output using the configured tns alias from your Oracle database home (tnsping <gateway tn alias>).

listener.ora -----
LISTENER =
  (DESCRIPTION_LIST =
    (DESCRIPTION =
      (ADDRESS = (PROTOCOL = IPC)(KEY = EXTPROC1521))
      (ADDRESS = (PROTOCOL = TCP)(HOST = myhost.localdomain)(PORT = 1521))    
      (ADDRESS = (PROTOCOL = TCP)(HOST = myhost.localdomain)(PORT = 1523))
    )
  )

SID_LIST_LISTENER =
   (SID_LIST =
     (SID_DESC =
      (GLOBAL_DBNAME = DB11GT )
      (ORACLE_HOME = /u01/app/oracle/product/11.2.0/db_1 )
      (SID_NAME = DB11GT )
     )
     (SID_DESC=
       (SID_NAME=GTW11T)
       (ORACLE_HOME=/u02/app/oracle/product/11.2.0/gtw_1)
       (ENVS=LD_LIBRARY_PATH=/u02/app/oracle/product/11.2.0/gtw_1/dg4db2/driver/lib;/u02/app/oracle/product/11.2.0/gtw_1/lib)  
       (PROGRAM=dg4db2)
     )
   )

ADR_BASE_LISTENER = /u01/app/oracle
------
tnsnames.ora -------
DB11GT=
  (DESCRIPTION =
    (ADDRESS = (PROTOCOL = TCP)(HOST = myhost.localdomain)(PORT = 1521))
    (CONNECT_DATA =
      (SERVER = DEDICATED)
      (SERVICE_NAME = DB11GT.localdomain)
    )
  )

GTW11T=
  (DESCRIPTION=
    (ADDRESS=(PROTOCOL=TCP)(HOST = myhost.localdomain)(PORT=1523))
    (CONNECT_DATA=(SID=GTW11T))
    (HS=OK)
  )
------
listener status ------
LSNRCTL for Linux: Version 11.2.0.1.0 - Production on 01-NOV-2011 09:23:19

Copyright (c) 1991, 2009, Oracle.  All rights reserved.

Connecting to (DESCRIPTION=(ADDRESS=(PROTOCOL=IPC)(KEY=EXTPROC1521)))
STATUS of the LISTENER
------------------------
Alias                     LISTENER
Version                   TNSLSNR for Linux: Version 11.2.0.1.0 - Production
Start Date                30-OCT-2011 14:22:36
Uptime                    1 days 19 hr. 0 min. 42 sec
Trace Level               off
Security                  ON: Local OS Authentication
SNMP                      OFF
Listener Parameter File   /u01/app/oracle/product/11.2.0/db_1/network/admin/listener.ora
Listener Log File         /u01/app/oracle/diag/tnslsnr/dbsandkassi4/listener/alert/log.xml
Listening Endpoints Summary...
  (DESCRIPTION=(ADDRESS=(PROTOCOL=ipc)(KEY=EXTPROC1521)))
  (DESCRIPTION=(ADDRESS=(PROTOCOL=tcp)(HOST=localhost)(PORT=1521)))
  (DESCRIPTION=(ADDRESS=(PROTOCOL=tcp)(HOST=localhost)(PORT=1523)))
Services Summary...
Service "DB11GT" has 1 instance(s).
  Instance "DB11GT", status UNKNOWN, has 1 handler(s) for this service...
Service "DB11GT.localdomain" has 1 instance(s).
  Instance "DB11GT", status READY, has 1 handler(s) for this service...
Service "DB11GTXDB.localdomain" has 1 instance(s).
  Instance "DB11GT", status READY, has 1 handler(s) for this service...
Service "GTW11T" has 1 instance(s).
  Instance "GTW11T", status UNKNOWN, has 1 handler(s) for this service...
The command completed successfully

-------
tnsping ----
TNS Ping Utility for Linux: Version 11.2.0.1.0 - Production on 01-NOV-2011 09:25:35

Copyright (c) 1997, 2009, Oracle.  All rights reserved.

Used parameter files:
/u01/app/oracle/product/11.2.0/db_1/network/admin/sqlnet.ora


Used TNSNAMES adapter to resolve the alias
Attempting to contact (DESCRIPTION= (ADDRESS=(PROTOCOL=TCP)(HOST = myhost.localdomain)(PORT=1523)) (CONNECT_DATA=(SID=GTW11T)) (HS=OK))
OK (40 msec)

------

Listener.ora and tnsnames.ora are also configured in the gateway network/admin directory.

Regards,
    Tomas Helgi

i hope this what you have used to create the DB link

create database link test connect to username identified by pwd using 'GTW11T';

and i hope all HS parameters set in you initsid.ora file for gateway.

 

Yes, all parameters in the initsid.ora are correct.
However when I create the database link like this
create database link test connect to username identified by pwd using 'GTW11T';
i get the linke name like this
TEST.LOCALDOMAIN
and the above ORA errors when I test the connection.

Regards,
   Tomas Helgi

I found the error myself.