ORA-12154 could not resolve the connect identifier specified

Question

I have switched over to the 64bit Windows 7 and created a simple web app to test the connection to the database  I am using VS 2010 - plain asp net web project and I am running the application from within VS    I am getting this error   ORA-12154 could not resolve the connect identifier specified   I also have a sample console application that tests the connection to the database  and it works fine   After googling it some  I found that a lot of posts online refered to permissions so I set my C  Oracle permissions to read write execute for my ASP net account  NETWORK SERVICE  COMPUTER NAME  That still won t solve the issue  I checked that my web app runs under my domain username account and that this account that the rights to read write execute to the C  Oracle folder    I even re-installed my VS to make sure that it is in C  Program Files rather than C  Program Files x86   Any ideas to why my web app doesn t see the connection string   while the console app does  Not sure what else I can do

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This is an old question but Oracle s latest installers are no improvement  so I recently found myself back in this swamp  thrashing around for several days      My scenario was SQL Server 2016 RTM  32-bit Oracle 12c Open Client   ODAC was eventually working fine for Visual Studio Report Designer and Integration Services designer  and also SSIS packages run through SQL Server Agent  with 32-bit option   64-bit was working fine for Report Portal when defining and Testing an Data Source  but running the reports always gave the dreaded  ORA-12154  error   My final solution was to switch to an EZCONNECT connection string - this avoids the TNSNAMES mess altogether   Here s a link to a detailed description  but it s basically just  host port sid  http   www oracledistilled com oracle-database oracle-net using-easy-connect-ezconnect-naming-method-to-connect-to-oracle-databases   In case it helps anyone in the future  or I get stuck on this again   here are my Oracle install steps  the full horror    Install Oracle drivers  Oracle Client 12c  32-bit  plus ODAC    a   Download and unzip the following files from http   www oracle com technetwork database enterprise-edition downloads database12c-win64-download-2297732 html and http   www oracle com technetwork database windows downloads utilsoft-087491 html     i   winnt 12102 client32 zip  ii  ODAC112040Xcopy 32bit zip  b   Run winnt 12102 client32 client32 setup exe  For the Installation Type  choose Admin  For the installation location enter C  Oracle Oracle12  Accept other defaults   c   Start a Command Prompt    As Administrator    and change directory  cd  to your ODAC112040Xcopy 32bit folder    d   Enter the command  install bat all C  Oracle Oracle12 odac   e   Copy the tnsnames ora file from another machine to these folders     i   C  Oracle Oracle12 network admin    ii  C  Oracle Oracle12 product 12 1 0 client 1 network admin    Install Oracle Client 12c  x64  plus ODAC  a   Download and unzip the following files from http   www oracle com technetwork database enterprise-edition downloads database12c-win64-download-2297732 html and http   www oracle com technetwork database windows downloads index-090165 html     i   winx64 12102 client zip  ii  ODAC121024Xcopy x64 zip  b   Run winx64 12102 client client setup exe  For the Installation Type  choose Admin  For the installation location enter C  Oracle Oracle12 x64  Accept other defaults   c   Start a Command Prompt    As Administrator    and change directory  cd  to the C  Software Oracle Client ODAC121024Xcopy x64 folder    d   Enter the command  install bat all C  Oracle Oracle12 x64 odac  e   Copy the tnsnames ora file from another machine to these folders     i   C  Oracle Oracle12 x64 network admin    ii  C  Oracle Oracle12 x64 product 12 1 0 client 1 network admin      If you are going with the EZCONNECT method  then these steps are not required   The ODAC installs are tricky and obscure - thanks to Dan English who gave me the method  detailed above  for that

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I had this error in Visual Studio 2013  with an SSIS project  I set Project  Properties  Debugging  Run64BitRuntime   false and then the SSIS package ran  However  when I deployed the package to the server I had to set the value to true  Server is 64 bit Windows 2012   Sql 2014     I think the reasoning behind this is that Visual Studio is a 32 bit application

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I had the same issue  In my case I was using a web service which was build using AnyCPU settings  Since the WCF was using 32 bit Oracle data access components therefore it was raising the same error when I tried to call it from a console client  So when I compiled the WCF service using the x86 based setting the client was able to successfully get data from the web service   If you compile as  Any CPU  and run on an x64 platform  then you won t be able to load 32-bit dlls  which in our case were the Oracle Data Access components   because our app wasn t started in WOW64  Windows32 on Windows 64   So in order to allow the 32 bit dependency of Oracle Data Access components I compilee the web service with Platform target of x86 and that solved it for me  As an alternative if you have 64bit ODAC drivers installed on the machine that also caused the problem to go away

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I am going to assume you are using the tnsnames ora file to specify your available database services  If so connection errors usually come down to two things    The application cannot find the TNS entry you specified in the connection string  The TNS entry was found  but the IP or host is not correct in the tnsnames ora file    To expand on number 1  which I think is your problem   When you tell Oracle to connect using something like   sqlplus user pass service   The service is defined in the tnsnames ora file  If I attempt to connect with a service that is not defined in my tnsnames ora  I get the error you get    sodonnel home     sqlplus sodonnel sodonnel nowhere  SQL Plus  Release 11 2 0 1 0 Production on Mon Oct 31 21 42 15 2011  Copyright  c  1982  2009  Oracle   All rights reserved   ERROR  ORA-12154  TNS could not resolve the connect identifier specified   So you need to check a few things    Is there a tnsnames ora file - I think yes because your console can connect Is there an entry in the file for the service - I think also yes as the console connects Can the application find the tnsnames ora    Your problem may well be number 3 - does the application run as a different user than when you run the console    Oracle looks for the tnsnames ora file in the directory defined in the TNS ADMIN environment variable - If you are running as different users  then maybe the TNS ADMIN environment variable is not set  and therefore it cannot find the file

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Please let me repeat what Stephen said since I missed it the first time myself  The TNS ADMIN environment variable and ORACLE HOME is set to C  instantclient 11 2 and th tnsnames ora file is in there  Found the answer on this link

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In my case  the reason for this error was that I was missing the tnsnames ora file under client 32 NETWORK ADMIN

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use process monitor and search for name not found log for tnsnames ora file    check your environment variables  if not valid than uninstall all oracle client and reinstall

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Another obnoxious error type I ve encountered in Oracle 11  entries in tnsnames ora that don t begin at the first column of the line    XXX        instead of  XXX         and are parsed together with the preceding entry  making it malformed   Like replaced orr misplaced tnsnames ora files  this type of problem is easy to diagnose with the tnsping command-line utility  you pass it the name of a tnsnames ora entry and it gives the complete text of its definition

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I have an Entity Framework web application that works on my local machine  but this error appears when pushed to another environment  There are other non-Entity Framework applications that work  and I m able to connect with sqlplus  Using sysinternals Process Monitor shows that tns names file is not being loaded correctly   Following the documentation I tried to add a section giving the location of the tnsnames file like so   lt configuration gt      lt configSections gt       lt section name  quot oracle manageddataaccess client quot        type  quot OracleInternal Common ODPMSectionHandler  Oracle ManagedDataAccess  Version 4 122 1 0  Culture neutral  PublicKeyToken 89b483f429c47342 quot   gt     lt  configSections gt        lt oracle manageddataaccess client gt       lt version number  quot   quot  gt         lt settings gt           lt setting name  quot TNS ADMIN quot  value  quot C  Oracle product 12 1 0 client 1 Network Admin quot   gt         lt  settings gt       lt  version gt     lt  oracle manageddataaccess client gt      lt configuration gt   However  this resulted in an immediate 500 server error  Further investigation showed that the dll I was packaging with the web application was version 4 122 1 0  while the Oracle client environment installed on the machine was 4 121 2 0  As explained in the Oracle EntityFramework package documentation  Note  If your application is a web application and the above entry was added to a web config and the same config section handler for  quot oracle manageddataaccess client quot  also exists in machine config but the  quot Version quot  attribute values are different  an error message of  quot There is a duplicate  oracle manageddataaccess client  section defined  quot  may be observed at runtime   If so  the config section handler entry in the machine config for  quot oracle manageddataaccess client quot  has to be removed from the machine config for the web application to not encounter this error   But given that there may be other applications on the machine that depended on this entry in the machine config  this config section handler entry may need to be moved to all of the application s  NET config file on that machine that depend on it   I attempted to add a separate version section in the  NET machine config without success  there existed a section for version 4 121 2 0 and I added a section for version 4 122 1 0   After I removed the  quot oracle manageddataaccess client quot  section from the machine config  the above addition to the web config resolved ORA-12154  Solution  1 summary   Remove  quot oracle manageddataaccess client quot  from  NET machine config Give TNS ADMIN configuration setting in web config as above   Solution 2 While researching this problem I found that the TNS ADMIN environmental variable was not set  I created a new environmental variable called TNS ADMIN and set the value to  quot C  Oracle product 12 1 0 client 1 Network Admin quot   I removed the web config changes  and removed the  quot oracle manageddataaccess client quot  section from  NET machine config  but still received ORA-12154  Only after I restarted the machine did this resolve the issue  Solution  2 summary   Create a new environmental variable called TNS ADMIN and set the value to  quot C  Oracle product 12 1 0 client 1 Network Admin quot  Restart machine   Solution 3 I added an entry for the correct version in the registry and this resolved the issue  HKLM Software Wow6432Node Oracle ODP NET Managed 4 121 2 0    The name of the key is TNS ADMIN and this points to the folder containing the tnsnames file  C  Oracle product 12 1 0 client 1 network   Not the C  Oracle product 12 1 0 client 1 network admin folder

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This error  and also ORA-6413  Connection not open  can also be caused by parentheses in the application executable path and a bug in the 10 2 0 1 or lower oracle client libraries    You should either upgrade your oracle client library or change the executable path   Further details see    http   blogs msdn com b debarchan archive 2009 02 04 good-old-connectivity-issue aspx http   social technet microsoft com Forums de-DE ab662d63-6385-4f73-b27f-d526048f601f connecting-to-oracle-on-64bit-x64-machine

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Use this link on Microsoft Support   I gave permission to IUSR MachineName user on oracle home folder and I was able to resolve the problem

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Had a similar issue  only my web app was fine and it was SQLPlus that was giving me issues connecting  and the ORA-12154 could not resolve the connect identifier specified error   I had 11g and 12 Oracle clients installed  My environment variables were all set to point at my 12 instance    ORACLE HOME   C  oracle product 12 PATH   C  oracle product 12 bin      TNS ADMIN   C  oracle product 12 network admin   There is also a registry entry required at HKLM Software Oracle KEY OraClient12Home1  a string entry of TNS ADMIN with the same path as the environment variable   I have a tnsnames ora at both C  oracle product 11 network admin and C  oracle product 12 network admin   As far as I know  both my web app and the 12 SQLPlus client I was using should have been using all 12 version variables   My troubleshooting steps    Change all environmental variables above from 12 to 11  Connect with 11g s SQLPlus  worked   Change all environmental variables above back from 11 to 12  Connect with 12 s SQLPlus again  worked     So I don t really know what caused 12 s SQLPlus to stop connecting  but this kind of reset may work for someone  so thought I d document it here

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There can be so many issues but if you are using oracle 10g   uninstall oracle 10g and also remove the value from registry and install oracle 11g  But if you are using oracle 11g   first go and check on registry if it is pointing to right home  Sometimes there can be more than one home because you install sql developer again and again   In that case either you can remove unnecessary home registry value or you can add tns and sql net file to all of those home  that might resolve the issue  I resolved mine in that way

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If you are using LDAP  make sure that the environment variable  TNS ADMIN  exists and points to the folder containing the file  ldap ora    If this variable does not exist  create it and restart Visual Studio

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