vnsprintf returned -1 in log_vwrite -- bizarre. Quitting.

Hi,

Yesterday I discovered a problem with Nessus 4.20 on Windows XP Professional 
SP2.
While scanning several hosts behind a cisco PIX 7.x firewall I got the error 
"vnsprintf returned -1 in log_vwrite -- bizarre. Quitting.".
The command line at first was "nmap -sS -sV -O -PI -oN <file> <target>", due to 
this problem I modified those options.
I tried -sT instead of -sS, since it didn?t work either I tried scanning 
without OS detection, it also didn't work.
Seems the PIX did something like generic application proxing, with nessus I saw 
thousends of open ports per host.

Dirk

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