App Control: Upgrade Attempts to 8.9+ Without .Net 4.8 Causes 404 Error on Assets > Computers

[#1]

Environment

• App Control Server: 8.9.x+

Symptoms

• Upgrade from prior version (8.8.x and below) to 8.9.x fails because .Net 4.8 is missing
• After failed attempt, Assets > Computers gives 404 Error Stating:
  • Requested URL: https://<servername>:443/computers.php
  • Physical Path: C:\Program Files (x86)\Bit9\Parity Console\WebUI\html\Computers.php
• Computers.php does not exist in html\computers.php

Cause

Improper installer logic causes a redirect to be created even though computers.php does not yet exists (in 8.9 we renamed hosts.php to computers.php)

Resolution

There are two ways to correct this

1. Install .Net Version 4.8 and then re-attempt the upgrade

or perform following workaround:

1. Login to the application server as the Carbon Black Service Account.
2. If an Agent is installed on the server, temporarily stop and unload Agent
3. Stop the App Control Server service.
4. Rename the following files:

   "C:\Program Files (x86)\Bit9\Parity Console\WebUI\html\Computers.php" to Computers-backup.php
   "C:\Program Files (x86)\Bit9\Parity Console\WebUI\html\hostsOld.php" to Computers.php

5. From an administrative command prompt issue the command: iisreset
6. Start the App Control Server service and confirm navigating to Assets > Computers loads correctly.
7. If an Agent was temporarily stopped, load and start the service again.

Additional Notes

This is being investigated and is being tracked under EA-22698