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If this .NET exception happens without any reasonable cause, then it might be resolved by re-mapping permissions, at leasyt in my case it did. This error can happen if you have recently upgraded to a newer version of Oracle client (in my case it happenned after I upgraded to 9.2). To resolve this issue follow the following steps.
1. Browse to the Oracle root folder (my case, d:\oracle\Ora92)
2. In this folder's properties window, goto the Security tab and check whether 'Authenticated Users' is present. If not then add this user.
3. Now check the following properties for 'Authenticated Users'. If they are already checked then you must uncheck them first and then re-check them again - this is part of the trick.
-Read & Execute
-List Folder Contents
-Read
4. Next part of the trick is to ensure that in the Advanced permissions section, the 'Authenticated Users' have 'This folder, Sub folder and files' in the Apply To column. Be very careful with what you do in the advanced permissions window as flawed changes might have undesirable effects on rest of the folder hierarchy permissions.
That is all. A system restart was not needed in my case.
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