Steps to reproduce:

1. Install Agent and Agent 2 using MSI (or archive)
2. Perform identical setup steps with the same active/passive server
3. No errors from Windows to start both daemons, setup active monitoring
4. Everything works, except you have double history and not working passive checks

Expected:
Detect duplicate client with server/proxy or at least check with installer that one agent is already running on the same network interface/port.