IIS 6 problems – IIS seems like blocking the second request

I'm having very weird issue with IIS. My server is 2003 advanced server. I installed .NET 2 and .NET 4 on that server (.NET 1 is already there). We are running ASP.NET 2.0 site, ASP.NET 4.0 site and ASP.NET MVC site with different pool.. ASP.NET 2.0 site and ASP.NET MVC 3 (Surprise?) are working fine. I'm having problem with asp.net 4.0 or html.

I created a virtual directory under web site. The execute permission is "Scripts and Execute" and ASP.NET 4.0.30319.

I put a HTML file called a.html under that virtual directory and I click on "Browse" to view the html. It's working fine. I closed the browser and I click on "browse" again for second time. And then, here I got an error.

In IE, I got this error "Internet Explorer cannot display the webpage"

In Chrome, I got this below.

This web page is not available
The web page at http://192.168.105.2:170/simpleweb/c.html might be temporarily down or it may have moved permanently to a new web address.
Error 330 (net::ERR_CONTENT_DECODING_FAILED): Unknown error.

In Firefox, I got this..

Content Encoding Error
The page you are trying to view cannot be shown because it uses an invalid or unsupported form of compression.
Please contact the website owners to inform them of this problem.

I'm spending the whole day to figure out but it's not working … Does anyone has any idea about this issue?

When I tried with asp.net 4 site, I got the same issue as well. but asp.net 2 and asp.net mvc are working fine..

Thanks in advance.

Edit

Here is the log

Software: Microsoft Internet Information Services 6.0
Version: 1.0
Date: 2011-12-14 06:27:57
Fields: date time s-sitename s-ip cs-method cs-uri-stem cs-uri-query s-port cs-username c-ip cs(User-Agent) cs(Referer) sc-status sc-substatus sc-win32-status sc-bytes cs-bytes 
2011-12-14 06:27:56 W3SVC1531730165 127.0.0.1 GET /simpleweb/c.html - 170 - 127.0.0.1 Mozilla/4.0+(compatible;+MSIE+7.0;+Windows+NT+5.2;+.NET+CLR+1.1.4322;+.NET+CLR+2.0.50727;+.NET4.0C;+.NET4.0E) - 200 0 0 378 284
2011-12-14 06:28:23 W3SVC1531730165 127.0.0.1 GET /simpleweb/d.html - 170 - 127.0.0.1 Mozilla/4.0+(compatible;+MSIE+7.0;+Windows+NT+5.2;+.NET+CLR+1.1.4322;+.NET+CLR+2.0.50727;+.NET4.0C;+.NET4.0E) - 200 0 0 343 284
2011-12-14 06:28:26 W3SVC1531730165 127.0.0.1 GET /simpleweb/d.html - 170 - 127.0.0.1 Mozilla/4.0+(compatible;+MSIE+7.0;+Windows+NT+5.2;+.NET+CLR+1.1.4322;+.NET+CLR+2.0.50727;+.NET4.0C;+.NET4.0E) - 200 0 0 378 373
2011-12-14 06:28:26 W3SVC1531730165 127.0.0.1 GET /simpleweb/d.html - 170 - 127.0.0.1 Mozilla/4.0+(compatible;+MSIE+7.0;+Windows+NT+5.2;+.NET+CLR+1.1.4322;+.NET+CLR+2.0.50727;+.NET4.0C;+.NET4.0E) - 200 0 0 378 489
2011-12-14 06:28:28 W3SVC1531730165 127.0.0.1 GET /simpleweb/d.html - 170 - 127.0.0.1 Mozilla/4.0+(compatible;+MSIE+7.0;+Windows+NT+5.2;+.NET+CLR+1.1.4322;+.NET+CLR+2.0.50727;+.NET4.0C;+.NET4.0E) - 200 0 0 378 489
2011-12-14 06:28:29 W3SVC1531730165 127.0.0.1 GET /simpleweb/d.html - 170 - 127.0.0.1 Mozilla/4.0+(compatible;+MSIE+7.0;+Windows+NT+5.2;+.NET+CLR+1.1.4322;+.NET+CLR+2.0.50727;+.NET4.0C;+.NET4.0E) - 200 0 0 378 489
2011-12-14 06:28:29 W3SVC1531730165 127.0.0.1 GET /simpleweb/d.html - 170 - 127.0.0.1 Mozilla/4.0+(compatible;+MSIE+7.0;+Windows+NT+5.2;+.NET+CLR+1.1.4322;+.NET+CLR+2.0.50727;+.NET4.0C;+.NET4.0E) - 200 0 0 378 489
2011-12-14 06:28:33 W3SVC1531730165 127.0.0.1 GET /simpleweb/d.html - 170 - 127.0.0.1 Mozilla/4.0+(compatible;+MSIE+7.0;+Windows+NT+5.2;+.NET+CLR+1.1.4322;+.NET+CLR+2.0.50727;+.NET4.0C;+.NET4.0E) - 200 0 0 378 489
2011-12-14 06:29:27 W3SVC1531730165 127.0.0.1 GET /simpleweb/d.html - 170 - 127.0.0.1 Mozilla/4.0+(compatible;+MSIE+7.0;+Windows+NT+5.2;+.NET+CLR+1.1.4322;+.NET+CLR+2.0.50727;+.NET4.0C;+.NET4.0E) - 200 0 0 378 284