SharePoint 2010: Working with Web.config Files

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Topic	You may need to modify web.config files to make your solution work in the Microsoft SharePoint Foundation environment.
Location	Web.config files are contained in the following folders within the file system: • \\Inetpub\wwwroot\wss\VirtualDirectories\ Port_Number — The web.config file that defines configuration settings for a SharePoint content Web application. • \\Inetpub\wwwroot\wss\VirtualDirectories\ Port_Number_of_Central_Administration — The web.config file that defines configuration settings for the SharePoint Central Administration application. • \\Inetpub\wwwroot\wss\VirtualDirectories\ Port_Number \wpresources — The web.config file used in the Web application's Web Part resources. • \\Program Files\Common Files\Microsoft Shared\Web Server Extensions\wpresources — A web.config file that is used in Web Part resources for the global assembly cache. • %ProgramFiles%\Common Files\Microsoft Shared\web server extensions\14\CONFIG — The web.config file and other .config files that together define configuration settings for extending other Web applications. • %ProgramFiles%\Common Files\Microsoft Shared\web server extensions\14\ISAPI — The web.config file that defines configuration settings for the /_vti_bin virtual directory. • %ProgramFiles%\Common Files\Microsoft Shared\web server extensions\14\TEMPLATE\LAYOUTS — The web.config file that defines configuration settings for the /_layouts virtual directory.
Link	MSDN Page

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