IIS + CI Problems!

[eluser]Roosevelt![/eluser]
Hi there,
Recently I started to test out my CI products in IIS Server environment, and I noticed this problem. And I really hope somebody can help me solve this problem .

If I visit CI Application homepage like (http://localhost/ci/) by not modifying config.php file, I get 404 Page Not found error.

Then if I change $config['uri_protocol'] = "AUTO"; to $config['uri_protocol'] = "PATH_INFO";

The welcome page loads just fine .

However, if I visit http://localhost/ci/index.php/welcome, it doesn't work . The error HTTP Error 502.2 - Bad Gateway by IIS.

Any ideas on how to fix this other than using query strings? I LOVE FRIENDLY URLS! .