[root@server ~]# nmap -sS -sV -O -p 22 -P0 -v 203.101.67.152

Starting nmap 3.70 ( http://www.insecure.org/nmap/ ) at 2006-07-19 16:46 PDT
Initiating SYN Stealth Scan against 203.101.67.152 [1 port] at 16:46
Discovered open port 22/tcp on 203.101.67.152
The SYN Stealth Scan took 2.19s to scan 1 total ports.
Initiating service scan against 1 service on 203.101.67.152 at 16:46
The service scan took 2.37s to scan 1 service on 1 host.
Warning:  OS detection will be MUCH less reliable because we did not find at least 1 open and 1 closed TCP port
For OSScan assuming that port 22 is open and port 44728 is closed and neither are firewalled