Downloading a file in a C# Ajax application does not work when deployed to server. Running locally is fine and has no issues

Making the question more specific with less unknowns: On success in the ajax call, I do a redirect as follows. My issue is that the Controller function is never hit (I put in logging and breakpoints).

NOTE: Please note that this works fine when I run the app locally but not if I deploy to the application server. I get an error that is listed in the original post below.

AJAX Code:

$(document).ready(function () {
        $('#777').on('click', function () {
            $.ajax({
                type: "POST",   
                url: "Report/createFile",
                dataType:"json",
                success: function (data) {
                    var response = data;
                    alert("OK");
                    alert(response.FileGuid);
                    alert(response.FileName);
                    if (response != null &&
                        response.FileGuid != null &&
                        response.FileName != null) {
                        alert("Ready to redirect...");
                        window.location = '/Report/Download?fileGuid=' +  
                             response.FileGuid + '&filename=' + 
                                      response.FileName;

                    }
                    else {
                        alert("Error downloading file");
                    }
                },
                error: function (data) {
                    alert("Report Generation Failed.");
                },
            });
        });
    });

C# controller:

[HttpPost]
public ActionResult createFile()
{
    // Some processing...
    // returning the JSON object 
    return new JsonResult()
    {
        Data = new { FileGuid = handle, FileName = 
                             "TestReportOutput.xlsx" }
    };
}

    [HttpGet]
    public ActionResult Download(string fileGuid, string fileName)
    {
        // !! This code is never reached even though Ajax success 
        // !! function is executed after return from createFile() function
    }

Old post:
I am downloading a file through a C# and ajax web application.  
I used the following for reference:
https://stackoverflow.com/questions/16670209/download-excel-file-via-ajax-mvc

CSL's provided approach worked very well for me.  However, once I published the app to a test server, the download fails with resource not found (404 error).  It is looking for the created file in the physical path c:\inetpub\wwwwroot\Report\Download\TestReportOutput.xlsx and cannot find it.  

i never had to create this physical path when running locally so not sure what I missed.  

Running the app locally is completely fine with no issues.  

This is the error message I get

Detailed Error Information


+ Module    IIS Web Core
+ Notification  MapRequestHandler
+ Handler   StaticFile
+ Error Code    0x80070002
+ Requested URL http://localhost:80/Report/Download?fileGuid=04d40144-db9b-4b96-88c0-0ccb1a080c8c&filename=TestReportOutput.xlsx
+ Physical Path C:\inetpub\wwwroot\Report\Download
+ Logon Method  Negotiate

I am not familiar with intricacies of server deployment so would appreciate any assistance or tips. 

static file handler takes your request and watches site directory for file, because of existence of similar directory , so your action will never call. change your download action name and test it.