Oracle ORA-12154 error on local IIS, but not with Visual Studio Development Server

Question

I\'ve got an ASP.NET application that can connect to Oracle when it\'s started by Visual Studio Development Server, but when I deploy it to my local IIS, it does not connect

Answer 1

In my case, I use Windows 7, IIS 7, Visual Studio 2010. For some reason I have installed 2 Oracle clients, 10.2 and 11.2 (I have 2 TNSNAMES.ORA in two differents path). When I use F5, Visual Studio use one TNSNAME and when I use IIS, It use the other TNSNAME!

If I use CMD and write:

tnsping ORCL

It give me the Oracle vertion I use is: 10.2 and not 11.2. I try turn off the Windows Firewall and not work. I try login in IIS->AppPool with my Windows Account and either not work.

Finally to fix (after 2 days reading a lot of solutions in stackoverflow and others):

• I give read access to both path C:\oracle\product and C:\app\user\product to Everyone account user, because I not found Network Service account.

• In IIS -> AppPool, I set ApplicationPoolIdentity to my Pool.

• In IIS I recycle the AppPool and Restart my WebSite.

and It Works!