After upgrading 9.x to 10.x the /api throws "404 - not found"

If after upgrading your self-hosted helpdesk from "9.x" to "10.x" all API calls start returning "404 - File or Directory not found" try this:

Open the file "C:\Windows\System32\inetsrv\Config\applicationHost.config" and check if there's a section that configures access to "/api" location. Something like:

   <location path="Default Web Site/helpdesk/api">
        <system.webServer>
            <security>
                <authentication>
                    <anonymousAuthentication enabled="true" />
                </authentication>
            </security>
        </system.webServer>
    </location>

Simply remove that section and it should work. It was required for older versions, but not the one based on ".NET Core" (aka NET 5 and later)

api

Creation date: 1/17/2023 12:16 PM Updated: 1/17/2023 1:51 PM

Solving problems with on-premises version of Jitbit Helpdesk ticketing system