Problem: web.config is Read-only Isolation : Check upgrade.log at %commonprogramfiles%\Microsoft Shared\Web Server Extensions\12\ BIN \LOGS, looking for the following error: [IisWebSiteSequence] [ERROR] [10/17/2007 11:38:22 AM]: Access to the path 'C:\Inetpub\wwwroot\wss\VirtualDirectories\5003\web.config'