After installing CA Automation Point at a Windows Server Platform (2008 or 2012) you can launch the CA AP Web Message viewer (WebMV) and the first part of the screen is displayed, but followup logon screen doesnt appear..
At the top of the screen is also the message :
HTTP 404.7 - Not Found The request filtering module is configured to deny the file extension
or a picture isnt displayed.
A setting in IIS has changed since release 7.0/7.5.
The allowUnlisted attribute is set to false. Additionally, the file name extensions of the files that you want to browse are not listed.
The solution to solve the problem is to set the allowUnlisted to true
See for instructions on the Microsoft website: