nessus generated different results?!

["Doug Fox" <dfox168 () hotmail com>]

Lately, I ran NESSUS 2.6 against a list of seven (7) Check Point VPN-1 on 
Windows hosts with different results:

The 1st run, the report showed 6 hosts instead of all 7, missing one host. 
( I had triple checked the IP addresses were accurate.)
The 2nd run, right after the first run, against the same list of hosts, the 
report showed three (3) hosts *including* the one missing in the 1st run, 
five their disappeared, or not responded.
The 3rd run, on the second day, the report showed 2 hosts.

Appreciate any thought on these scenarios are appreciated.

Thanks,

DF


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