The SQL*Net Easy Config edits a file called TNSNAMES.ORA. The TNSNAMES file is located in your %ORACLE_HOME%\Network\Admin directory on your computer. This file has a listing of the different database instances that your machine is configured to attach to. An example of an entry in this file follows:
MYDB.MYCOMPANY.COM =
(DESCRIPTION =
(ADDRESS_LIST =
(ADDRESS = (PROTOCOL = TCP)(HOST = 123.45.678.90)(PORT = 1521))
)
(CONNECT_DATA =
(SID = MYDB)
)
)
This specifies that on the machine located at the listed IP Address, there is a database instance called MYDB.SBC.COM with an Oracle SID of MYDB. BTW, I manually edit this file using notepad, but that is because I am experienced with it. Until you are that way, I recommend using the SQL*Net Easy Config, but you can open it with Notepad and look at it.
There is also a file called SQLNET.ORA in that same directory that could contain the following line:
names.default_domain=mycompany.com
If this line is there, you can reference the database as MYDB instead of MYDB.MYCOMPANY.COM.
If all of this information is correct for your case, and if the listener on that database is on, you should be able to connect. Check with your DBA and Network Admin to verify these values.
Hope that helps... Terry M. Hoey