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AJAX Call Works on LocalHost, doesn't anywhere else

I've inherited a website that I'm migrating to a new server (Windows Server 2003 to Windows Server 2012).  Everything seems to work after the migration except one of my ajax calls.  Below is the code that fails:

  var encodedInput = $.toJSON(input);
        type: "POST",
        url: "Sim.svc/revenue",
        contentType: "application/json; charset=utf-8",
        data: encodedInput,
        dataType: "json",
        error: fnError,
        success: ... 

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The sim.svc code is:
<%@ ServiceHost Language="C#" Debug="true" Service="W.Services.Sim" Factory="W.Services.AppServiceHostFactory" %>

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W.Services.SIm is a dll.

This ajax call works if I'm on the production server and use http://localhost:80/page.aspx.  However, if I try and access the website (on the production or any where else) using www.domainName/page.aspx the ajax call fails.  

The only thing that indicates that the call has failed is a custom message that says: 'loading failed'.  When I use firebug, it says that sim.svc/renenue is  not found (404)

Any ideas?

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I've made a little progress, because I have multiple bindings to this site (e.g. and I have to add multipleSiteBindingsEnabled="true"   to the    <serviceHostingEnvironment /> element in the web.config file.

<serviceHostingEnvironment  multipleSiteBindingsEnabled="true" aspNetCompatibilityEnabled="true" /> 

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Now,  I'm getting an error that says 'the input string is not in a correct format'.  I get this error if I access it via the domain name or localhost.
Avatar of Aaron Jabamani
Using the developer tools you check the request going in. Check the request is fine.

Had a chance  to look at web API ?

Thanks for the response.  I have hesitated checking the response as I wouldn't think that it would change by simply changing from localhost to domainName.  I will check that now with firebug.  I need to stress that the application workd before I added the multiple bindings element when I used http://localhost:....) but it didn't work if I use (on production server) .  Once I added the multiple bindings element neither site works, but I don't get an error in the event viewer.

I don't know if this helps, but the response from firebug is:

'InternalServerError'</P><P><B>Details: </B>Input string was not in a correct format.</P><!-- Padding xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx--
Ok.  I compared the response via a 'compare document' in word (inputs are 2 pages long).  The only difference between the website that is working and the website that is not working is on the website that is not working the LastModified input is:
"LastModified": "/Date(21600000-0600)/"

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On the website that is working, the lastModified input is:

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I'm not sure why these are different so I'm going to look into the code....But it looks like it is valid.
This might be the problem.  On the New server, in the response headers it has:
Content-Type:      text/html

In the old server (that works) it has:
Content-Type: application/json; charset=utf-8

any idea's how to fix it?
It looks like the Conet-Type is text/html because the error is being returned as such.  Doesn't look like that is what is causing the problem.
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Only had one response.  That response while appreciated, didn't help me in solving question.