The web.config file resides on the web server. It's exact location
depends on where on the machine they had set up the website.
For example if you website is called http://localhost/XYZ
On the webserver, please perform the following steps
- Select Start => Run
- Type in Inetmgr.
- The Internet Information Service Manager will appear
- In the Internet Information Service Manager locate the website XYZ.
- Right click it, look in the properties there you will see the source
files location for this website
- Browse to that location and search the web.config inside that folder
