inconsistent nmap results

["" <frenzie () pop powweb com>]

I have had some abnormal results using nmap 4.10 to do a syn TCP scan on a particuylar external network range. When i 
ran the scan as a full port scan of 0-65535, all ports are found to be filtered. Yet we know that port 10443 is open, 
and when i do a scan on that port, it is found to be open.

This has meant a number of open ports have been missed in scanning this range.

Is there something obvious that i have omitted, other more usual ports were found open on other hosts.

----------------------------------------------------------------
# Nmap 4.10 scan: nmap -sS -P0 -p0-65535 -T4 -oA outputfile xx.xx.xx.xx/24 

All 65536 scanned ports on host (xx.xx.xx.yy) are filtered
----------------------------------------------------------------

----------------------------------------------------------------
nmap -sS -P0 -p10443 xx.xx.xx.yy -T4
Starting Nmap 4.10

Interesting ports on host (xx.xx.xx.yy):
PORT      STATE SERVICE
10443/tcp open  unknown

Nmap finished: 1 IP address (1 host up) scanned in 4.560 seconds
----------------------------------------------------------------

thanks for your time
Shanna



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