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Connecting to Oracle from Within Visual Studio Fails With: ORA-12154 or ORA-6413, While Compiled Applications Run Fine (Doc ID 334968.1)

Last updated on JANUARY 30, 2022

Applies to:

Oracle Data Provider for .NET - Version 10.2.0.1.0 and later
Oracle Net Services - Version 8.1.7.0.0 to 10.2.0.1.0 [Release 8.1.7 to 10.2]
Oracle Objects for OLE - Version 8.1.7.0 to 10.2.0.1 [Release 8.1.7 to 10.2]
Oracle ODBC Driver - Version 8.1.7.0.0 to 10.2.0.1.0
Oracle Provider for OLE DB - Version 8.1.7.0 to 10.2.0.1.0
Microsoft Windows x64 (64-bit)

Symptoms

You are developing an application inside Microsoft Visual Studio and receive one of the following errors when trying to connect to the Oracle database

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

        or

     ORA-6413: Connection not open.

Additionally...

  • You can compile your application and then run the executable outside this location and it connects and executes successfully
  • You have installed 32-bit Oracle client software on a 64-bit Windows operating system (OS)

Cause

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In this Document
Symptoms
Cause
Solution
References

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