Error in hosting Multiple web application (asp.net) on same ip address with IIS7

1.) using two seperated web-SITES:
set host name for port-bindings, so that IIS can determine which web-site is requested by analyzing the request URL (rightclick web-SITE and choose "edit bindings"
e.g.:
web-SITE1: binds to hostname app1.example.com, port:80
web-SITE2: binds to hostname app2.example.com, port:80

IIS will then chose the right web-SITE for you. You will then be unable to access your web-SITES using only the IP-Address, as IIS needs the HOSTHEADER (=host name in IIS bindings) to determine the right web-SITE.

2.) alternatively, you can run multiple web-APPLICATIONS under one web-SITE, just right-click on the web-SITE and choose "add Application"...
e.g.:
web-site: binds to hostname app.example.com, port:80
- web-Application1 with alias "app1"
- web-application2 with alias "app2"

Clients can access app1 using Url app.example.com/app1, etc.


don't know which one fits better to your needs...

Edit1:
as you are facing case 2.), i asume that you have a web.config at web-SITE level and one on application-level. check, if there are add-Elements with the same name in it.