It kind of depends on what kind of firewall you're referring to and how its configuration is stored on client machines, but Lansweeper can certainly report on machines where the Windows Firewall service isn't running for instance or where it's disabled (by performing a custom registry scan for the firewall settings). Lansweeper doesn't perform a complete analysis of a machine's open ports however.
It kind of depends on what kind of firewall you're referring to and how its configuration is stored on client machines, but Lansweeper can certainly report on machines where the Windows Firewall service isn't running for instance or where it's disabled (by performing a custom registry scan for the firewall settings). Lansweeper doesn't perform a complete analysis of a machine's open ports however.