I have a web application (ISAPI) that accesses a SQL Server 2000 (sp3) database in the same machine as the Web Server (IIS 6). Windows 2003 Standard Edition is the operating System. So, when users access the aplication through the web it runs ok until display the error message "Invalid authorization specification" or, sometimes, another message about failure to inform ODBC DSN, although I dont use ODBC.
When the error occurs, the user press F5 in the browser and the operation goes ok. It's an intermitent and curious error.