ORA-12154: TNS:could not resolve the connect identifier

Question

I am simply trying to move a site from a Windows 2003 32bit server to a Windows 2008 R2 64-bit. The database was on and is remaining on the 2008 server. Trying to run the new site results in:
ORA-12154: TNS:could not resolve the connect identifier
This error pops up more than a few times in the forums but do not seem unique to my situation where I know the connection string works fine from another server. Any insights?

Answer 1

Working
Microsoft Windows [Version 5.2.3790]
(C) Copyright 1985-2003 Microsoft Corp.
C:\>SET
ALLUSERSPROFILE=C:\Documents and Settings\All Users
APPDATA=C:\Documents and Settings\Cherie.Jarvis\Application Data
ARCGISHOME=D:\Program Files\ArcGIS\
CLIENTNAME=ZEKIAH-PC463
ClusterLog=C:\WINDOWS\Cluster\cluster.log
CommonProgramFiles=C:\Program Files\Common Files
CommonProgramFiles(x86)=C:\Program Files (x86)\Common Files
COMPUTERNAME=CFLGIS1
ComSpec=C:\WINDOWS\system32\cmd.exe
FP_NO_HOST_CHECK=NO
HOMEDRIVE=C:
HOMEPATH=\Documents and Settings\Cherie.Jarvis
LOGONSERVER=\\BATMAN
NUMBER_OF_PROCESSORS=4
ORACLE_HOME=D:\Ora11g\Administrator\product\11.1.0\db_1
OS=Windows_NT
Path=D:\Program Files\ArcGIS\ArcSDE\ora11gexe\bin;D:\Ora11g\Administrator\produc
t\11.1.0\db_1\bin;D:\Ora11g\Administrator\product\11.1.0\db_1;D:\Ora11g_Client32
\product\11.1.0\client_3;D:\Ora11g_Client32\product\11.1.0\client_3\bin;C:\WINDO
WS\system32;C:\WINDOWS;C:\WINDOWS\System32\Wbem;C:\Program Files (x86)\Microsoft
SQL Server\90\Tools\binn\;C:\Program Files\ArcGIS\ArcSDE\ora11gexe\bin
PATHEXT=.COM;.EXE;.BAT;.CMD;.VBS;.VBE;.JS;.JSE;.WSF;.WSH
PROCESSOR_ARCHITECTURE=AMD64
PROCESSOR_IDENTIFIER=EM64T Family 6 Model 23 Stepping 10, GenuineIntel
PROCESSOR_LEVEL=6
PROCESSOR_REVISION=170a
ProgramFiles=C:\Program Files
ProgramFiles(x86)=C:\Program Files (x86)
PROMPT=$P$G
PYTHONPATH=D:\Program Files\ArcGIS\bin
SDEFORCEXDR=1
SDEHOME=C:\Program Files\ArcGIS\ArcSDE\ora11gexe\
SESSIONNAME=RDP-Tcp#461
SystemDrive=C:
SystemRoot=C:\WINDOWS
TEMP=C:\DOCUME~1\CHERIE~1.JAR\LOCALS~1\Temp\1
TMP=C:\DOCUME~1\CHERIE~1.JAR\LOCALS~1\Temp\1
TNS_ADMIN=D:\Ora11g\Administrator\product\11.1.0\db_1\NETWORK\ADMIN
USERDNSDOMAIN=CFLHD.LOCAL
USERDOMAIN=CFLHD
USERNAME=Cherie.Jarvis
USERPROFILE=C:\Documents and Settings\Cherie.Jarvis
VS90COMNTOOLS=D:\Program Files\Microsoft Visual Studio 9.0\Common7\Tools\
windir=C:\WINDOWS
C:\Documents and Settings\Cherie.Jarvis>
Not Working
Microsoft Windows [Version 6.1.7600]
Copyright (c) 2009 Microsoft Corporation. All rights reserved.
C:>set
AGSSERVERJAVA=C:\Program Files (x86)\ArcGIS\Server10.0\
ALLUSERSPROFILE=C:\ProgramData
ANT_HOME=D:\Software\apache-ant-1.8.1
APPDATA=C:\Users\cherie.jarvis\AppData\Roaming
CLIENTNAME=ZEKIAH-PC463
CommonProgramFiles=C:\Program Files\Common Files
CommonProgramFiles(x86)=C:\Program Files (x86)\Common Files
CommonProgramW6432=C:\Program Files\Common Files
COMPUTERNAME=CFLGIS2
ComSpec=C:\Windows\system32\cmd.exe
FP_NO_HOST_CHECK=NO
HOMEDRIVE=C:
HOMEPATH=\Users\cherie.jarvis
JAVA_HOME=D:\Program Files\Java\jdk1.6.0_22
LOCALAPPDATA=C:\Users\cherie.jarvis\AppData\Local
LOGONSERVER=\\BATMAN
NUMBER_OF_PROCESSORS=16
ORACLE_HOME=D:\ORA11G\Administrator\product\11.1.0\db_1
OS=Windows_NT
Path=D:\app\Zekiah\product\11.1.0\client_2;D:\app\Zekiah\product\11.1.0\client_2
\bin;D:\Program Files (x86)\PHP\;D:\Ora11g_Client32\product\11.1.0\client_1\bin;
D:\Ora11g\administrator\product\11.1.0\db_1\bin;C:\Windows\system32;C:\Windows;C
:\Windows\System32\Wbem;C:\Windows\System32\WindowsPowerShell\v1.0\;D:\Program F
iles\ArcGIS\ArcSDE\ora11gexe\bin;D:\Program Files (x86)\MySQL\MySQL Server 5.1\b
in;D:\Program Files\Java\jdk1.6.0_22\bin;D:\Software\apache-ant-1.8.1\bin;D:\Pro
gram Files\TortoiseSVN\bin
PATHEXT=.COM;.EXE;.BAT;.CMD;.VBS;.VBE;.JS;.JSE;.WSF;.WSH;.MSC
PHPRC=D:\Program Files (x86)\PHP\
PROCESSOR_ARCHITECTURE=AMD64
PROCESSOR_IDENTIFIER=Intel64 Family 6 Model 44 Stepping 2, GenuineIntel
PROCESSOR_LEVEL=6
PROCESSOR_REVISION=2c02
ProgramData=C:\ProgramData
ProgramFiles=C:\Program Files
ProgramFiles(x86)=C:\Program Files (x86)
ProgramW6432=C:\Program Files
PROMPT=$P$G
PSModulePath=C:\Windows\system32\WindowsPowerShell\v1.0\Modules\
PUBLIC=C:\Users\Public
SDEHOME=D:\Program Files\ArcGIS\ArcSDE\ora11gexe\
SESSIONNAME=RDP-Tcp#0
SystemDrive=C:
SystemRoot=C:\Windows
TEMP=C:\Users\CHERIE~1.JAR\AppData\Local\Temp\2
TMP=C:\Users\CHERIE~1.JAR\AppData\Local\Temp\2
USERDNSDOMAIN=CFLHD.LOCAL
USERDOMAIN=CFLHD
USERNAME=Cherie.Jarvis
USERPROFILE=C:\Users\cherie.jarvis
VISUALSVN_SERVER=D:\Program Files (x86)\VisualSVN Server\
windir=C:\Windows