While attempting to discover the remote operating system on the target computer, you receive the following results from an nmap scan:
Starting nmap V. 3.10ALPHA9 ( www.insecure.org/nmap/ )
Interesting ports on 172.121.12.222:
(The 1592 ports scanned but not shown below are in state: filtered) PortStateService
21/tcpopenftp
25/tcpopensmtp
53/tcpcloseddomain
80/tcpopenhttp
443/tcpopenhttp
Remote operating system guess: Too many signatures match to reliably guess the OS.
Nmap run completed — 1 IP address (1 host up) scanned in 277.483 seconds
What would you do next to fingerprint the OS?