Io ho risolto sistemando questo baco di Oracle :
The issue below is a security issue that we have found that deals
> with Oracle9i, you may want to review it and see if it could be an
> issue.
>
>
> Problem Description
> -------------------
>
> When running an application using the Oracle9i Release 2 (9.2.0.1.0)
> install of client software and that attempts to connect to an Oracle
> database with the Authenticated User privilege (such as when you use
> Microsoft's Internet Information Server (IIS)) through any of the
> following programmatic interfaces
>
> 1. Oracle Provider for OLE DB
> 2. Microsoft OLE DB Provider for Oracle
> 3. Oracle ODBC Driver
> 4. Microsoft ODBC for Oracle
> 5. Oracle Objects for OLE (OO4O)
> 6. Microsoft .NET Framework Data Provider for Oracle
>
> you may receive one of the following errors:
>
> (1) Oracle Provider for OLE DB
>
> (a) Error Type: Microsoft OLE DB Service Components (0x80070005)
>
> Access is denied.
>
> (b) OraOLEDB.Oracle Provider is not registered on the local machine
>
> (2) Microsoft OLE DB Provider for Oracle
>
> (a) Error Type: Microsoft OLE DB Provider for Oracle (0x80004005)
>
> Oracle client and networking components were not found. These components
> are supplied by Oracle Corporation and are part of the Oracle Version
> 7.3.3 or later client software installation. Provider is unable to
> function until these components are installed.
>
> (b) Error Type: Microsoft OLE DB Provider for Oracle (0x80004005)
>
> Oracle error occurred, but error message could not be retrieved from
> Oracle.
>
> (3) Oracle ODBC Driver
>
> (a) Error Type: Microsoft OLE DB Provider for ODBC Drivers (0x80004005)
>
> Specified driver could not be loaded due to system error 5 (Oracle in
> OraHome92).
>
> (4) Microsoft ODBC for Oracle
>
> (a) The Oracle(tm) client and networking components were not found.
> These components are supplied by Oracle Corporation and are part of the
> Oracle Version 7.3 (or greater) client software installation.
>
> You will be unable to use this driver until these components have been
> installed.
>
> (b) Error number: -2147467259
>
> Error Description: [Microsoft][ODBC Driver Manager] Driver's
> SQLAllocHandle on SQL_HANDLE_ENV failed
>
> (5) Oracle Objects for OLE
>
> (a) while using a GLOBAL.ASA file
>
> Error Type: Active Server Pages (0x0)
>
> An error occurred while creating object 'OraSession'.
>
> (b) not using a GLOBAL.ASA file
>
> Error Type: Microsoft VBScript runtime (0x800A0046)
>
> Permission denied: 'CreateObject'
>
> (6) Microsoft .NET Framework Data Provider for Oracle
>
> (a) System.DllNotFoundException: Unable to load DLL (oci.dll). at
> System.Data.OracleClient.DBObjectPool.GetObject(Boolean&
> isInTransaction)
> at System.Data.OracleClient.OracleConnectionPoolManager.
> GetPooledConnection(String encryptedConnectionString,
> OracleConnectionString options, Boolean& isInTransaction) at
> System.Data.OracleClient.OracleConnection.OpenInternal
> (OracleConnectionString parsedConnectionString, Object transact) at
> System.Data.OracleClient.OracleConnection.Open()
> at WCWSItemAvailability.ETAAvailability.SingleAvailability(String
> ItemNumber, String BusinessUnit, Int32 OrderQty, Int32& AvailableQty,
> Int32& OnHandQty, String& ETADate, Int32& Error) at
> WCWSItemAvailability.ETAAvailability.XMLAvailability(String
> XMLInput)
>
> (7) Other miscellaneous errors
>
> (a) The Specified Module Could Not Be Found
>
> (b) ORA-00604: error occurred at recursive SQL level 1
> ORA-12705: invalid or unknown NLS parameter value specified
>
> (c) Unable to load DLL (OraOps9.dll):
> ...
> [DllNotFoundException: Unable to load DLL (OraOps9.dll).]
>
> (d) System Error 998 trying to run ASP page
>
> Solution Description
> --------------------
>
> Oracle 9.2 Client software requires that you give the Authenticated User
> privilege to the Oracle Home by following these steps:
>
> 1. Log on to Windows as a user with Administrator privileges.
>
> 2. Launch Windows Explorer from the Start Menu and and navigate to the
> ORACLE_HOME folder. This is typically the "Ora92" folder under the
> "Oracle" folder (i.e. D:\Oracle\Ora92).
>
> 3. Right-click on the ORACLE_HOME folder and choose the "Properties"
> option from the drop down list. A "Properties" window should appear.
>
> 4. Click on the "Security" tab of the "Properties" window.
>
> 5. Click on "Authenticated Users" item in the "Name" list (on Windows XP
> the "Name" list is called "Group or user names").
>
> 6. Uncheck the "Read and Execute" box in the "Permissions" list under
> the "Allow" column (on Windows XP the "Permissions" list is called
> "Permissions for Authenticated Users").
>
> 7. Re-check the "Read and Execute" box under the "Allow" column (this is
> the box you just unchecked).
>
> 8. Click the "Advanced" button and in the "Permission Entries" list make
> sure you see the "Authenticated Users" listed there with:
>
> Permission = Read & Execute
> Apply To = This folder, subfolders and files
>
> If this is NOT the case, edit that line and make sure the "Apply onto"
> drop-down box is set to "This folder, subfolders and files". This should
> already be set properly but it is important that you verify this.
>
> 9. Click the "Ok" button until you close out all of the security
> properties windows. The cursor may present the hour glass for a few
> seconds as it applies the permissions you just changed to all subfolders
> and files.
>
> 10. Reboot your computer to assure that these changes have taken effect.
>
> Re-execute the application and it should now work.
>
> Explanation
> -----------
>
> If you install Oracle9i Release 2 (9.2.0.1.0) on a computer running
> Windows with an NTFS partition, the contents of ORACLE_HOME directory
> will not be visible to users who are authenticated on that machine.
> These permissions were not set properly when the software was installed.
>
> Applications that were working fine with previous versions of Oracle
> software will stop working when they upgrade to Oracle 9.2.
>
> NOTE: The application will continue to work if the user has logged onto
> the machine as an Administrator.
>
> Any application that is using the Authenticated User privilege will not
> work. A notable example would be IIS which might service some of the
> requests based on the Authenticated User privileges.
>
> To demonstrate the problem in further detail, you can log on to the
> operating system as an authenticated machine user. You won't be able
> browse the contents of the ORACLE_HOME directory demonstrating your
> inability to load any Oracle DLLs or make a connection.
>
> Additional Information
> ----------------------
>
> The above error messages may not only be encountered when using Oracle
> 9.2 client software but may also exists when running into general
> permissions issues using third party products on a Windows platform.
>
>
>
>