Hello,

I have been trying to get Umbraco 7.2.5 working on Windows 2012 server running IIS 8.5. The database is hosted on SQL Server 2014.

I am able to load the website/homepage/etc however when attempting to access the backoffice via http://mydomain.com/umbraco I'm getting a blank white screen.

I have tested this across multiple devices and browsers and they all return the same blank white screen.

Using developer tools in Chrome I can see that loading the backoffice is resulting in a 404 error on the following script: /umbraco/Application?umb__rnd=ffffffff8e063945

Here is the relevant code from the page:

    <script type="text/javascript">
    var Umbraco = {};
    Umbraco.Sys = {};
    Umbraco.Sys.ServerVariables = {
        "umbracoUrls": {                
            "authenticationApiBaseUrl": "/umbraco/backoffice/UmbracoApi/Authentication/",
            "serverVarsJs": '/umbraco/ServerVariables?umb__rnd=ffffffff8e063945'
        },
        "application": {
            "applicationPath" : "/"
        }
    };       
</script>


<script type="text/javascript" src="lib/rgrove-lazyload/lazyload.js"></script>
<script type="text/javascript" src="/umbraco/Application?umb__rnd=ffffffff8e063945"></script>

There are no useful/relevant errors being recorded in the Umbraco trace logs, the IIS logs or in the Windows Event Viewer.

This issue occurs on an existing Umbraco site (being migrated from another web server) as well as a new manual installation of Umbraco.

I have confirmed that the app pool user has the necessary permissions as per the Umbraco documentation. I even tested granting "Everyone" full control on the entire installation and it made no difference.

I suspect there is some kind of application-specific redirect that is meant to be happening here, but I don't know enough about Umbraco to know why it would be failing or where to start looking.

Any help would be greatly appreciated.

Cheers.