I have website abc.com and abc.co.in.I have two webservers also. The following issue happens only in abc.co.in with same application deployed on same. We have written a custom IHttpModule and do a rewrite to abc.co.in?some=data.

Expected behavior: When user enters some.abc.co.in the expected behavior is browser still display some.abc.co.in but internally call abc.co.in?some=data Actual behavior: The page is rendered properly but in browser the URL changes to some.abc.co.in?some=data

I checked what is happening 1.First the server receives the request and does a 301 redirect. 2.The redirect location is some.abc.co.in?some=data

I am stuck in this for a day and critical to fix to make our site up and running. How to debug this issue further ?.Any one can think of possible cause?

ETW Trace shows

<ApplicationData>
<TraceData>
<DataItem>
<OldUrl>/</OldUrl>
<NewUrl>/fp?&id=hazzel&params=</NewUrl>
</DataItem>
</TraceData>
</ApplicationData>


<ApplicationData>
<TraceData>
<DataItem>
<ModuleName>DefaultDocumentModule</ModuleName>
<Notification>128</Notification>
<HttpStatus>301</HttpStatus>
<HttpReason>Moved Permanently</HttpReason>
</DataItem>
</TraceData>
</ApplicationData>


<ApplicationData>
<TraceData>
<DataItem>
<Headers>Content-Type: text/html; charset=UTF-8
Location: http://some.abc.co.in/fp/?id=data
Server: Microsoft-IIS/7.5
X-Powered-By: ASP.NET
</Headers>
</DataItem>
</TraceData>
</ApplicationData>