Database Link with 11g R2 and Teradata

Trying to create a database link from Oracle to a Teradata database using Oracle Database Gateway, and I'm receiving ORA-12154: TNS:could not resolve the connect identifier specified...
I'm pretty new at this and my head is spinning a bit. After following the gateway configuration instructions it seems there are 3 sets of tnsnames.ora/listener.ora/sqlnet.ora files
1) on the database server
2) on my local computer where oracle is installed
3) on my local computer where the gateway is installed
Is this how it should be? Which set should I be working with to resolve this error? Any other advice for this newbie would be amazing! Let me know what other information I can share to help describe the issue. I've tried so many things at this point, I'm not really sure what's relevant and what's not anymore.

Ok, got it. I was not in the command prompt as an administrator for my first couple attempts. Results are below. I have been replacing host names with italicized descriptions because this is my first time posting on a forum and I'm not sure that my employer would be okay with me posting those specifics. Let me know if this is hindering the troubleshooting process.
STATUS of the LISTENER
Alias                     LISTENER
Version                   TNSLSNR for 32-bit Windows: Version 11.2.0.1.0 - Produ
ction
Start Date                18-JUN-2014 10:01:08
Uptime                    0 days 0 hr. 0 min. 5 sec
Trace Level               off
Security                  ON: Local OS Authentication
SNMP                      OFF
Listener Parameter File   C:\product\11.2.0\tg_1\network\admin\listener.ora
Listener Log File         c:\product\11.2.0\tg_1\log\diag\tnslsnr\COQC2DPRDMGT00
1\listener\alert\log.xml
Listening Endpoints Summary...
(DESCRIPTION=(ADDRESS=(PROTOCOL=tcp)(HOST=local computer where gateway is installed)(P
ORT=1521)))
Services Summary...
Service "dg4tera" has 1 instance(s).
Instance "dg4tera", status UNKNOWN, has 1 handler(s) for this service...
The command completed successfully
C:\WINDOWS\system32>
C:\WINDOWS\system32>tnsping dg4tera
TNS Ping Utility for 32-bit Windows: Version 11.2.0.1.0 - Production on 18-JUN-2
014 10:02:03
Copyright (c) 1997, 2010, Oracle. All rights reserved.
Used parameter files:
C:\oracle\product\11.2.0\client_1\network\admin\sqlnet.ora
Used TNSNAMES adapter to resolve the alias
Attempting to contact (DESCRIPTION= (ADDRESS= (PROTOCOL=TCP) (HOST=local computer where gateway is installed) (PORT=1521)) (CONNECT_DATA= (SID=dg4tera)) (HS=OK))
OK (10 msec)
C:\WINDOWS\system32>
C:\WINDOWS\system32>

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