UCM webpage fails to load with error HTTP Error 404.7 - Not Found The request filtering module is configured to deny the file extension.

Document ID : KB000100643
Last Modified Date : 16/07/2018
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Issue:
After a successful installation of the UCM console, the webpage will not open and gives the following error:

User-added image
Environment:
UCM 4.3.1 on Windows Server 2012
Cause:
This issue is caused by having the "allowUnlisted" attribute set to "false" in the applicationHost.config file.  As per Microsoft, this attribute is set to "true" by default.  
Resolution:
1- Open the applicationHost.config file, which is located in the %windir%\System32\inetsrv\config\ directory, with a text editor.    

2- Locate the <requestFiltering> section, and change <fileExtensions allowUnlisted="false" applyToWebDAV="true"> to <fileExtensions allowUnlisted="true" applyToWebDAV="true">

3Save the file and refresh your browser to load the UCM webpage. 

If your are unable to change the above setting in your environment, you can leave it set to "false" and add the following entries below it: 

           <requestFiltering>
                <fileExtensions allowUnlisted="false" applyToWebDAV="true">
                    <add fileExtension=".gif" allowed="true" />
                    <add fileExtension=".png" allowed="true" />
                    <add fileExtension=".css" allowed="true" /> 
                    <add fileExtension=".js" allowed="true" />
                    <add fileExtension=".asmx" allowed="true" />
                    <add fileExtension=".aspx" allowed="true" />


  Then save the file and refresh the browser to load the UCM webpage.  
Additional Information: