FATAL ERROR when add resp: rst_all;

[crazy mand <crazymand2001 () yahoo com>]

I'm having a problems with snort when add resp:
rst_all to some rules.. FATAL ERROR: ERROR: cannot
open raw socket for libnet, exiting...

Here's the rule: 
var RESP_ALL resp:rst_all,icmp_all;
alert tcp $EXTERNAL_NET any -> $HTTP_SERVERS 80
(msg:"WEB-IIS webdav file lock attempt"; flags:A+;
content:"LOCK "; offset:0; depth:5;
reference:bugtraq,2736;
classtype:web-application-activity; sid:969; rev:1;
$RESP_ALL;)


Does anyone have any idea why and how to get it work?

Thanks for any help!


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