System.Data.OracleClient requires Oracle client software version 8.1.7

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I have a web site that I developed on Vista using Vb.net9. It makes a connection to Oracle. for the connection I use System.Data.OracleClient. It works fine on my machine, and our test server, but it does not work on the production server. We installed the Oracle Client 11 on the server. The error is System.Data.OracleClient requires Oracle client software version 8.1.7

We've tried, making a console app that opens the connection, connection runs fine, opens, displays a message and all is well there.

Then we make a simple web form, put it in the directory of the program, just a button, opens the connection, try..catch, grabs error, same error.

The console app was running under an Administrator, web site running under iwam. Is it possible that iwam has a different path?

oracle vb.net
7 Answers

I've run into this error dozens of times:

Cause

Security permissions were not properly set when the Oracle client was installed on Windows with NTFS. The result of this is that content of the ORACLE_HOME directory is not visible to Authenticated Users on the machine; this causes an error while the System.Data.OracleClient is communicating with the Oracle Connectivity software from ASP.NET using Authenticated User privileges.

Solution

To fix the problem you have to give the Authenticated Users group privilege to the Oracle Home directory.

  • Log on to Windows as a user with Administrator privileges.
  • Start Windows Explorer and navigate to the ORACLE_HOME folder.
  • Choose properties on the ORACLE_HOME folder.
  • Click the Security tab of the Properties window.
  • Click on Authenticated Users item in the Name list.
  • Un-check the Read and Execute box in the Permissions list under the Allow column.
  • Re-check the Read and Execute box under the Allow column.
  • Click the Advanced button and in the Permission Entries verify that Authenticated Users are listed with permission: Read & Execute, and Apply To: This folder, subfolders and files. If not, edit that line and make sure that Apply To drop-down box is set to This folder, subfolders and files. This should already be set properly but it is important that you verify it.
  • 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.
  • Reboot, to assure that the changes have taken effect.

Try your application again.

user_84320

Update 1: It is possible for different users to have different path. But its not the likely problem here. There is more chance that the user that the iwam user doesn't have permission to the oracle client directory.

Update 0: Its suppose to work. Check for environment variable ( That are needed to find the oracle client and tnsnames.ora ). Also, Maybe you have a 32/64 bit issues. Also, consider using the Oracle Data Provider for .NET ( search for odp.net)

Igal_Serban_257370

Oracle Client version 11 cannot connect to 8i databases. You will need a client in version 10 at most.

Mac_86960

When we first moved over to Vista with Oracle 10g, we experienced this issue when we installed the Oracle client on our Vista boxes, even when we were running with admin privileges during install.

Oracle brought out a new version of the 10g client (10.2.0.3) that was Vista compatible.

I do believe that this was after 11g was released, so it is possible that there is a 'Vista compatible' version for 11g also.

user_9512800

Why not use this: dotConnect for Oracle (formerly known as OraDirect .NET)?

It can be configured to not require an Oracle Client at all.

We have been using this in both Windows Services and ASP.NET Web Services and it works like a charm.

user_292900
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