OS detection

Hello,

I am running Nessus 2.0.12 with Nmap 3.7 and Mandrake Linux 10. I ran
scans against a large number of systems recently, driven by target hosts
files, and have found that the reports indicated the operating system
for only ~20% of the target hosts scanned most of which are running
Windows 2000. In most cases neither the Nessus nor Nmap operating system
detection has reported anything. (Scans of the same set of hosts with
earlier Nessus/Nmap/Mandrake versions identified the OS at least for
~all the Windows systems). However, when I ran a scan against a couple
of the Windows 2000 systems (without changing any settings), that had
been previously scanned with no OS reported, the resulting report this
time included the OS. I seem to have a serious performance problem. Any
ideas what is going wrong here or where to look? 

--
Carl Nelson
Distributed Systems Support Section, Computer Centre,
University of Leicester, Leicester, LE1 7RH, U.K.
Tel: +44 (0)116 252 2060, Fax: +44 (0)116 252 5027
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