Ray,

Do you know for sure there are ports open on that system?
Try looking at some interesting ports first. Like smtp/http(s)/ssh etc.
don't use all port at once.

Scan a few ports first, some systems have a blocking function that if
you hit some interessting ports in a short time they block you and
report all ports as filtered/closed, or there is some other protection
in front (IPS).

If nessus doesn't find any ports it will not find any vulnerabilities.

-- Ferdy

Ray DuBose wrote:
> Hey,
> 
>  
> 
>  Fairly new to nessus so be kind.  I have 2 IP’s that I’ve been asked to
> scan.  When I run NMAP against them using –sS I get several filtered ports:
> 
>  
> 
> (The 56612 ports scanned but not shown below are in state: closed)
> 
> PORT      STATE    SERVICE
> 
> 21/tcp    filtered ftp
> 
> 22/tcp    filtered ssh
> 
> 23/tcp    filtered telnet
> 
> 80/tcp    filtered http
> 
> 137/tcp   filtered netbios-ns
> 
> 161/tcp   filtered snmp
> 
> 162/tcp   filtered snmptrap
> 
> 443/tcp   filtered https
> 
> 491/tcp   filtered go-login
> 
> 554/tcp   filtered rtsp
> 
> 3389/tcp  filtered ms-term-serv
> 
> 4441/tcp  filtered unknown
> 
> 4444/tcp  filtered krb524
> 
> 5350/tcp  filtered unknown
> 
> 7070/tcp  filtered realserver
> 
> 8000/tcp  filtered http-alt
> 
> 8080/tcp  filtered http-proxy
> 
> 8087/tcp  filtered unknown
> 
> 8380/tcp  filtered unknown
> 
> 8480/tcp  filtered unknown
> 
> 10000/tcp filtered snet-sensor-mgmt
> 
> 10130/tcp filtered unknown
> 
> 11889/tcp filtered unknown
> 
>  
> 
> But when I run a Nessus Scan against the same host I get nothing back
> other than a genera/tcp
> 
> Information about this scan :
> 
>  
> 
> Nessus version : 3.0.2
> 
> Plugin feed version : 200603211235
> 
> Type of plugin feed : Release
> 
> Scanner IP : 10.1.11.113
> 
> Port scanner(s) : synscan
> 
> Port range : 1-65535
> 
> Thorough tests : no
> 
> Experimental tests : no
> 
> Paranoia level : 1
> 
> Report Verbosity : 1
> 
> Safe checks : yes
> 
> Max hosts : 16
> 
> Max checks : 10
> 
> Scan Start Date : 2006/5/17 13:15
> 
> Scan duration : 285 sec
> 
>  
> 
> And general/UDP that just shows a traceroute to the host. I’m running
> Nessus on Fedora Core 5 and this is the latest version of Nessus as I
> just built it today.  I’ve tried all the port scanners that are listed
> as well as both the Linux Client and the Windows Client. The NMAP was
> run from the same Nessus Server.  Am I doing something wrong?
> 
>  
> 
> Ray
> 
>  
> 
> 
> ------------------------------------------------------------------------
> 
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