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Nessus won't find open ports but Nmap will

Subject: Nessus won't find open ports but Nmap will
Date: Mon, 20 Mar 2006 08:08:43 +0000 (GMT)
I am using Suse 10 and the latest Nessus.  I use the NessusClient 1.0.0 GUI to 
do everything.
 
 Now if I use Nessus to scan against our Cisco concentrator it wont find any 
ports open, I use a range of 1-8000.  If I use Nmap it comes back with port 
1723 as being open which is correct.  With Nmap I use:
 
 nmap -v -sS -P0  <ip address> and get this result:
 
 (The 1662 ports scanned but not shown below are in state: filtered)
 PORT     STATE SERVICE
 1723/tcp open  pptp
 
 Why is Nessus not picking this up, I just use the Nessus port scanner.
 
 Andy
 
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