Penetration Testing: Port Scanning Issues

[crumdub12 () gmail com]

A Chairde,

   Havin, some issues with scanning stacks on my system.

1. Using Superscan4 ,  I scan stack UDP-TCP 1-65534 , Sometimes I 
get no ports open , another time I get 49159 UDP Ports open, only get port report, no attempt made to open any ports 
... , when get open ports , I always get 49159 UDP Ports ...... , use the scanner at 250msecs , takes around 16 hours 
to finish.

2. Using Languard, Nessus and Retina , get different scans from each tool, any ideas why, how do I find out real ports 
open.. differences can be 10,000 ports


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