use namp to detect remote box port

root@test:~# nmap -sU -p1434 -PO -sS 175.x.2.x

Starting Nmap 5.00 ( http://nmap.org ) at 2011-06-15 16:57 EDT
Interesting ports on 175.x.2.x:
PORT STATE SERVICE
1434/tcp filtered ms-sql-m
1434/udp open|filtered ms-sql-m