HSL not working?

[root@iris:Active] config  b rule myrule list
rule myrule {
   when HTTP_REQUEST {
        
         Save Request Side Information
        
        set hsl [HSL::open -proto UDP -pool splunk]
        set http_request "\"[HTTP::method] [HTTP::uri] HTTP/[HTTP::version]\""
        set http_request_time [clock clicks -milliseconds]
        set http_user_agent "\"[HTTP::header User-Agent]]\""
        set http_host [HTTP::host]
        set http_username [HTTP::username]
        set client_ip [IP::remote_addr]
        set client_port [TCP::remote_port]
        set http_request_uri [HTTP::uri]
        set referer "\"[HTTP::header value referer]\""
}

when HTTP_RESPONSE {
        set response_time [expr {[clock clicks -milliseconds] - $http_request_time}]
        set timestamp [clock format [clock seconds] -format "%d/%h/%Y:%T %Z" -gmt 1 ]
        set virtual [virtual]
        set content_length 0
        if { [HTTP::header exists "Content-Length"] } {
                set content_length [HTTP::header "Content-Length"]
        }

        set lb_server "[LB::server addr]:[LB::server port]"
        if { [string compare "$lb_server" ""] == 0 } {
                set lb_server ""
        }

        set status_code [HTTP::status]
        set content_type [HTTP::header "Content-type"]
        set log_msg ""
        append log_msg "virtual=$virtual "
        append log_msg "$client_ip "
        append log_msg "client_port=$client_port "
        append log_msg "lb_server=$lb_server "
        append log_msg "$http_host "
        append log_msg "$http_username "
        append log_msg "\[$timestamp\] "
        append log_msg "$http_request_uri "
        append log_msg "$http_request "
        append log_msg "$status_code "
        append log_msg "content_type=$content_type "
        append log_msg "$content_length "
        append log_msg "resp_time=$response_time "
        append log_msg "$referer "
        append log_msg "$http_user_agent\n"

        log local0. "Sending log to HSL"
        HSL::send $hsl $log_msg
}
}

[root@iris:Active] config  b pool splunk list
pool splunk {
   members 192.168.206.102:shell {}
}

[root@iris:Active] config  tail /var/log/ltm
Oct 25 22:23:45 local/tmm info tmm[4672]: Rule myrule : Sending log to HSL

C:\>nc -l -u -p 514
172.28.17.30 172.28.17.33  [25/Oct/2011:14:23:45 GMT] "GET / HTTP/1.1" 200 103 "" "curl/7.15.5 (i686-redhat-linux-gnu) libcurl/7.15.5 OpenSSL/0.9.8b zlib/1.2.3 libidn/0.6.5]"