Problem

User can not deploy a task because the download fails. In the tasklockfile you can find that the files with the extension .config can not be found.

Cause

Some files are not served off of IIS because they are typically part of the building blocks of the website itself.
You can find a list of them tied up in the IIS management setting "Request Filtering".

Solution

1. Open Internet Information Services (IIS) Manager on the Core Server.
2. Click on the LANDESK website under Sites or Default Web Site
3. Open 'Request Filtering' in the center panel.
4. Inside the 'Request Filtering' in the 'File Name Extensions' tab, right-click the file extensions that is failing to download (.config) and select 'Remove...' option.
5. Start 'command prompt' tool (cmd) and enter following command to restart IIS services: IISRESET