"HNAdapter" Problem?

  I used to have not trouble with Nessus. But suddenly I have become unable to 
scan other hosts?
   
  Here is an example:
   
  [Sat Oct 21 21:13:21 2006][XXXX] Use default port range 
[Sat Oct 21 21:13:29 2006][XXXX] Only ethernet is supported for now (type of 
{C7XX.XX.XX.XX} = 23) 
[Sat Oct 21 21:13:48 2006][XXXX] user localuser : testing XX.XX.XX.XX 
(XX.XX.XX.XX) [XXXX] 
[Sat Oct 21 21:13:48 2006][XXXX] Scan XX.XX.XX.XX using 11444 plugins 
[Sat Oct 21 21:13:52 2006][XXXX] HNAdapter({C7XX.XX.XX.XX}) can not be found 
[Sat Oct 21 21:13:52 2006][XXXX] The remote host (XX.XX.XX.XX) is dead 
[Sat Oct 21 21:13:52 2006][XXXX] Finished testing XX.XX.XX.XX. Time : 23.103 
secs, 6 plugins launched 
[Sat Oct 21 21:13:52 2006][XXXX] 1 hosts scanned 
   
  I have WinXP and a McAfee Firewall. I tried with and without the Firewalls, 
but had no positive results. I also reinstalled Winpcap, etc. No improvements.
   
  The only thing I am able to do, is to scan myself. I am also able to update 
Nessus. The "Scan Server Configuration" indicates that everything is OK.
   
  I noticed no problems with other scanners like X-Scan, etc.
   
  So what is the problem with the "HNAdapter"? What should I do?
   
  Please help, Rolf

                
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