Why won't this setting open the database?

I have been fighting with this one with no success. I'm having trouble hooking into our database. Below is an example of what I have in my TNSNAMES.ORA file. 
DBASE.bb.com =
   (DESCRIPTION =
     (ADDRESS_LIST =
       (ADDRESS = (PROTOCOL = TCP)(HOST = aa.bb.com)(PORT = 1521))
     )
     (CONNECT_DATA =
       (SERVICE_NAME = DBASE)
     )
   )

When running SQL*Plus I am able to open the database no problem. However, my colleagues have the following. 

 DBASE =
   (DESCRIPTION =
     (ADDRESS_LIST =
       (ADDRESS = (PROTOCOL = TCP)(HOST = aa.bb.com)(PORT = 1521))
     )
     (CONNECT_DATA =
       (SERVICE_NAME = DBASE)
     )
   )

With this setting, I can't open the database. I get the 'Cannot Resolve Database' error. Why would this be happening? Is there something else I need to do?

Also my colleagues are able to open database remotely over dial-up connection with this setting. I cannot connect at all. I keep getting the 'Can't resolve service name' error.

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The only difference between the two definitions is that one explicitly states the domain, "bb.com" and the other one doesn't. If you are having problems, check your NAMES.DEFAULT_DOMAIN or NAME.DEFAULT_ZONE parameters in your SQLNET.ORA file. You can also try to explicitly state the domain when connecting to the database like:

sqlplus userid/password@dbase.bb.com

This was first published in December 2003

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