diff --git a/heartbeat/portblock b/heartbeat/portblock
index 53b35e965..608556612 100755
--- a/heartbeat/portblock
+++ b/heartbeat/portblock
@@ -1,477 +1,548 @@
 #!/bin/sh
 #
 # portblock: iptables temporary portblocking control 
 #
 # Author:	Sun Jiang Dong (initial version)
 #               Philipp Reisner (per-IP filtering)
 #
 # License:	GNU General Public License (GPL)
 #
 # Copyright:	(C) 2005 International Business Machines
 #
 #	  OCF parameters are as below:
 #		OCF_RESKEY_protocol
 #		OCF_RESKEY_portno
 #		OCF_RESKEY_action
 #		OCF_RESKEY_ip
 #		OCF_RESKEY_tickle_dir
 #		OCF_RESKEY_sync_script
 #######################################################################
 # Initialization:
 
 : ${OCF_FUNCTIONS_DIR=${OCF_ROOT}/lib/heartbeat}
 . ${OCF_FUNCTIONS_DIR}/ocf-shellfuncs
 
 # Defaults
 OCF_RESKEY_ip_default="0.0.0.0/0"
+OCF_RESKEY_reset_local_on_unblock_stop_default="false"
 
 : ${OCF_RESKEY_ip=${OCF_RESKEY_ip_default}}
+: ${OCF_RESKEY_reset_local_on_unblock_stop=${OCF_RESKEY_reset_local_on_unblock_stop_default}}
 #######################################################################
 CMD=`basename $0`
 TICKLETCP=$HA_BIN/tickle_tcp
 
 usage()
 {
 	cat <<END >&2
 	usage: $CMD {start|stop|status|monitor|meta-data|validate-all}
 
 	$CMD is used to temporarily block ports using iptables.
 
 	It can be used to turn off a port before bringing
 	up an IP address, and enable it after a service is started.
 	To do that for samba, the following resource line can be used:
 
 	$CMD::tcp::137,138::block		\\
 	    10.10.10.20				\\
 	    nmbd smbd 				\\
 	    $CMD::tcp::137,138::unblock
 
 	This will do the follwing things:
 
 	  - DROP all incoming packets for TCP ports 137 and 138
 	  - Bring up the IP alias 10.10.10.20
 	  - start the nmbd and smbd services
 	  - Re-enable TCP ports 137 and 138
 	        (enable normal firewall rules on those ports)
 
 	This prevents clients from getting ICMP port unreachable
 	if they try to reconnect to the service after the alias is
 	enabled but before nmbd and smbd are running.  These packets
 	will cause some clients to give up attempting to reconnect to
 	the server.
 
 	NOTE:  iptables is linux-specific...
 
 	An additional feature in the portblock RA is the tickle ACK function
 	enabled by specifying the tickle_dir parameter. The tickle ACK 
 	triggers the clients to faster reconnect their TCP connections to the 
 	fail-overed server.
 
 	Please note that this feature is often used for the floating IP fail-
 	over scenario where the long-lived TCP connections need to be tickled.
 	It doesn't support the cluster alias IP scenario.
 
 	When using the tickle ACK function, in addition to the normal usage
 	of portblock RA, the parameter tickle_dir must be specified in the 
 	action=unblock instance of the portblock resources.
 	For example, you may stack resources like below:
 		portblock action=block
 		services
 		portblock action=unblock tickle_dir=/tickle/state/dir
 
 	If you want to tickle all the TCP connections which connected to _one_
 	floating IP but different ports, no matter how many portblock resources 
 	you have defined, you should enable tickles for _one_ portblock 
 	resource(action=unblock) only.
 	
 	The tickle_dir is a location which stores the established TCP 
 	connections. It can be a shared directory(which is cluster-visible to 
 	all nodes) or a local directory.
 	If you use the shared directory, you needn't do any other things.
 	If you use the local directory, you must also specify the sync_script
 	paramater. We recommend you to use csync2 as the sync_script.
 	For example, if you use the local directory /tmp/tickle as tickle_dir, 
 	you could setup the csync2 as the csync2 documentation says and 
 	configure your /etc/csync2/csync2.cfg like:
 		group ticklegroup {
 		  host node1;
 		  host node2;
 		  key  /etc/csync2/ticklegroup.key;
 		  include /etc/csync2/csync2.cfg;
 		  include /tmp/tickle;
 		  auto younger;
 		}
 	Then specify the parameter sync_script as "csync2 -xv".
 
 END
 }
 
 meta_data() {
 	cat <<END
 <?xml version="1.0"?>
 <!DOCTYPE resource-agent SYSTEM "ra-api-1.dtd">
 <resource-agent name="portblock">
 <version>1.0</version>
 
 <longdesc lang="en">
 Resource script for portblock. It is used to temporarily block ports 
 using iptables. In addition, it may allow for faster TCP reconnects
 for clients on failover. Use that if there are long lived TCP
 connections to an HA service. This feature is enabled by setting the
 tickle_dir parameter and only in concert with action set to unblock.
 Note that the tickle ACK function is new as of version 3.0.2 and
 hasn't yet seen widespread use.
 </longdesc>
 <shortdesc lang="en">Block and unblocks access to TCP and UDP ports</shortdesc>
 
 <parameters>
 <parameter name="protocol" unique="0" required="1">
 <longdesc lang="en">
 The protocol used to be blocked/unblocked.
 </longdesc>
 <shortdesc lang="en">protocol</shortdesc>
 <content type="string" default="" />
 </parameter>
 
 <parameter name="portno" unique="0" required="1">
 <longdesc lang="en">
 The port number used to be blocked/unblocked.
 </longdesc>
 <shortdesc lang="en">portno</shortdesc>
 <content type="integer" default="" />
 </parameter>
 
 <parameter name="action" unique="0" required="1">
 <longdesc lang="en">
 The action (block/unblock) to be done on the protocol::portno.
 </longdesc>
 <shortdesc lang="en">action</shortdesc>
 <content type="string" default="" />
 </parameter>
 
+<parameter name="reset_local_on_unblock_stop" unique="0" required="0">
+<content type="boolean" default="${OCF_RESKEY_reset_local_on_unblock_stop_default}" />
+<shortdesc lang="en">(try to) reset server TCP sessions when unblock stops</shortdesc>
+<longdesc>
+If for some reason the long lived server side TCP sessions won't be cleaned up
+by a reconfiguration/flush/stop of whatever services this portblock protects,
+they would linger in the connection table, even after the IP is gone
+and services have been switched over to an other node.
+
+An example would be the default NFS kernel server.
+
+These "known" connections may seriously confuse and delay a later switchback.
+
+Enabling this option will cause this agent to try to get rid of these connections
+by injecting a temporary iptables rule to TCP-reset outgoing packets from the
+blocked ports, and additionally tickle them locally,
+just before it starts to DROP incoming packets on "unblock stop".
+</longdesc>
+</parameter>
+
 <parameter name="ip" unique="0" required="0">
 <longdesc lang="en">
 The IP address used to be blocked/unblocked.
 </longdesc>
 <shortdesc lang="en">ip</shortdesc>
 <content type="string" default="${OCF_RESKEY_ip_default}" />
 </parameter>
 
 <parameter name="tickle_dir" unique="0" required="0">
 <longdesc lang="en">
 The shared or local directory (_must_ be absolute path) which 
 stores the established TCP connections.
 </longdesc>
 <shortdesc lang="en">Tickle directory</shortdesc>
 <content type="string" default="" />
 </parameter>
 
 <parameter name="sync_script" unique="0" required="0">
 <longdesc lang="en">
 If the tickle_dir is a local directory, then the TCP connection state
 file has to be replicated to other nodes in the cluster. It can be
 csync2 (default), some wrapper of rsync, or whatever. It takes the
 file name as a single argument. For csync2, set it to "csync2 -xv".
 </longdesc>
 <shortdesc lang="en">Connection state file synchronization script</shortdesc>
 <content type="string" default="" />
 </parameter>
 </parameters>
 
 <actions>
 <action name="start" timeout="20" />
 <action name="stop" timeout="20" />
 <action name="status" depth="0" timeout="10" interval="10" />
 <action name="monitor" depth="0" timeout="10" interval="10" />
 <action name="meta-data" timeout="5" />
 <action name="validate-all" timeout="5" />
 </actions>
 </resource-agent>
 END
 }
 
 
 #
 #	Because this is the normal usage, we consider "block"
 #	resources to be pseudo-resources -- that is, their status can't
 #	be reliably determined through external means.
 #	This is because we expect an "unblock" resource to come along
 #	and disable us -- but we're still in some sense active...
 #
 
 #active_grep_pat {udp|tcp} portno,portno
 active_grep_pat()
 {
   w="[ 	][ 	]*"
   any="0\\.0\\.0\\.0/0"
   echo "^DROP${w}${1}${w}--${w}${any}${w}${3}${w}multiport${w}dports${w}${2}\>"
 }
 
 #chain_isactive  {udp|tcp} portno,portno ip
 chain_isactive()
 {
   PAT=`active_grep_pat "$1" "$2" "$3"`
   $IPTABLES -n -L INPUT | grep "$PAT" >/dev/null
 }
 
 save_tcp_connections()
 {
 	[ -z "$OCF_RESKEY_tickle_dir" ] && return
 	statefile=$OCF_RESKEY_tickle_dir/$OCF_RESKEY_ip
 	if [ -z "$OCF_RESKEY_sync_script" ]; then
 		netstat -tn |awk -F '[:[:space:]]+' '
 			$8 == "ESTABLISHED" && $4 == "'$OCF_RESKEY_ip'" \
 			{printf "%s:%s\t%s:%s\n", $4,$5, $6,$7}' |
 			dd of="$statefile".new conv=fsync && 
 			mv "$statefile".new "$statefile"
 	else
 		netstat -tn |awk -F '[:[:space:]]+' '
 			$8 == "ESTABLISHED" && $4 == "'$OCF_RESKEY_ip'" \
 			{printf "%s:%s\t%s:%s\n", $4,$5, $6,$7}' \
 			> $statefile
 		$OCF_RESKEY_sync_script $statefile > /dev/null 2>&1 &
 	fi
 }
 
-run_tickle_tcp()
+tickle_remote()
 {
 	[ -z "$OCF_RESKEY_tickle_dir" ] && return
 	echo 1 > /proc/sys/net/ipv4/tcp_tw_recycle
 	f=$OCF_RESKEY_tickle_dir/$OCF_RESKEY_ip
-	[ -f $f ] && cat $f | $TICKLETCP -n 3
+	[ -r $f ] || return
+	$TICKLETCP -n 3 < $f
+}
+
+tickle_local()
+{
+	[ -z "$OCF_RESKEY_tickle_dir" ] && return
+	f=$OCF_RESKEY_tickle_dir/$OCF_RESKEY_ip
+	[ -r $f ] || return
+	# swap "local" and "remote" address,
+	# so we tickle ourselves.
+	# We set up a REJECT with tcp-reset before we do so, so we get rid of
+	# the no longer wanted potentially long lived "ESTABLISHED" connection
+	# entries on the IP we are going to delet in a sec.  These would get in
+	# the way if we switch-over and then switch-back in quick succession.
+	local i
+	awk '{ print $2, $1; }' $f | $TICKLETCP
+	netstat -tn | grep -Fw $OCF_RESKEY_ip || return
+	for i in 0.1 0.5 1 2 4 ; do
+		sleep $i
+		awk '{ print $2, $1; }' $f | $TICKLETCP
+		netstat -tn | grep -Fw $OCF_RESKEY_ip || break
+	done
 }
 
 SayActive()
 {
   echo "$CMD DROP rule for INPUT chain [$*]  is running (OK)"
 }
 
 SayConsideredActive()
 {
   echo "$CMD DROP rule for INPUT chain [$*] considered to be running (OK)"
 }
 
 SayInactive()
 {
   echo "$CMD DROP rule for INPUT chain [$*] is inactive"
 }
 
 #IptablesStatus  {udp|tcp} portno,portno ip {block|unblock}
 IptablesStatus() {
     local rc
     rc=$OCF_ERR_GENERIC
     activewords="$CMD $1 $2 is running (OK)"
     if chain_isactive "$1" "$2" "$3"; then
 	case $4 in
 	    block)	
 		SayActive $*
 		rc=$OCF_SUCCESS
 		;;
 	    *)
  		SayInactive $*
 		rc=$OCF_NOT_RUNNING
 		;;
 	esac
     else
 	case $4 in
 	    block)
 		if ha_pseudo_resource "${OCF_RESOURCE_INSTANCE}" status; then
 		    SayConsideredActive $*
 		    rc=$OCF_SUCCESS
 		else
 		    SayInactive $*
 		    rc=$OCF_NOT_RUNNING
 		fi
 		;;
 	    
 	    *)
 		if ha_pseudo_resource "${OCF_RESOURCE_INSTANCE}" status; then
 			SayActive $*
 			#This is only run on real monitor events.
 			save_tcp_connections
 			rc=$OCF_SUCCESS
 		else
 			SayInactive $*
 			rc=$OCF_NOT_RUNNING
 		fi
 		;;
 	esac
     fi      
     
     return $rc
 }
 
 #IptablesBLOCK  {udp|tcp} portno,portno ip
 IptablesBLOCK()
 {
+  local rc=0
+  local try_reset=false
+  if	[ "$1/$4/$__OCF_ACTION" = tcp/unblock/stop ] &&
+	ocf_is_true $reset_local_on_unblock_stop
+  then
+	try_reset=true
+  fi
   if
     chain_isactive "$1" "$2" "$3"
   then
     : OK -- chain already active
   else
+    if $try_reset ; then
+      $IPTABLES -I OUTPUT -p "$1" -s "$3" -m multiport --sports "$2" -j REJECT --reject-with tcp-reset
+      tickle_local
+    fi
     $IPTABLES -I INPUT -p "$1" -d "$3" -m multiport --dports "$2" -j DROP
+    rc=$?
+    if $try_reset ; then
+      $IPTABLES -D OUTPUT -p "$1" -s "$3" -m multiport --sports "$2" -j REJECT --reject-with tcp-reset
+    fi
   fi
 
-  return $?
+  return $rc
 }
 
 #IptablesUNBLOCK  {udp|tcp} portno,portno ip
 IptablesUNBLOCK()
 {
   if
     chain_isactive "$1" "$2" "$3"
   then
     $IPTABLES -D INPUT -p "$1" -d "$3" -m multiport --dports "$2" -j DROP
   else
     : Chain Not active
   fi
 
   return $?
 }
 
 #IptablesStart  {udp|tcp} portno,portno ip {block|unblock}
 IptablesStart()
 {
   ha_pseudo_resource "${OCF_RESOURCE_INSTANCE}" start
   case $4 in
     block)	IptablesBLOCK "$@";;
     unblock)
 		IptablesUNBLOCK "$@"
 		rc=$?
-		run_tickle_tcp
+		tickle_remote
 		#ignore run_tickle_tcp exit code!
 		return $rc
 		;;
     *)		usage; return 1;
   esac
 
   return $?
 }
 
 #IptablesStop  {udp|tcp} portno,portno ip {block|unblock}
 IptablesStop()
 {
   ha_pseudo_resource "${OCF_RESOURCE_INSTANCE}" stop
   case $4 in
     block)	IptablesUNBLOCK "$@";;
     unblock)
 		save_tcp_connections
 		IptablesBLOCK "$@"
 		;;
     *)		usage; return 1;;
   esac
 
   return $?
 }
 
 #
 #	Check if the port is valid, this function code is not decent, but works
 #
 CheckPort() {
 #	Examples of valid port: "1080", "1", "0080"
 #	Examples of invalid port: "1080bad", "0", "0000", ""
   echo $1 |egrep -qx '[0-9]+(:[0-9]+)?(,[0-9]+(:[0-9]+)?)*'
 }
 
 IptablesValidateAll()
 {
   check_binary $IPTABLES
   case $protocol in
     tcp|udp)
 	;;
     *)
 	ocf_log err "Invalid protocol $protocol!"
 	exit $OCF_ERR_CONFIGURED
 	;;
   esac
 
   if CheckPort "$portno"; then
 	:
   else
 	ocf_log err "Invalid port number $portno!"
 	exit $OCF_ERR_CONFIGURED
   fi
 
   if [ -n "$OCF_RESKEY_tickle_dir" ]; then
 	if [ x"$action" != x"unblock" ]; then
 		ocf_log err "Tickles are only useful with action=unblock!"
 		exit $OCF_ERR_CONFIGURED
 	fi
 	if [ ! -d "$OCF_RESKEY_tickle_dir" ]; then
 		ocf_log err "The tickle dir doesn't exist!"
 		exit $OCF_ERR_INSTALLED	  	
 	fi
   fi
 
   case $action in
     block|unblock)	
 	;;
     *)		
 	ocf_log err "Invalid action $action!"
 	exit $OCF_ERR_CONFIGURED
 	;; 
   esac
+
+  if ocf_is_true $reset_local_on_unblock_stop; then
+	if [ $action != unblock ] ; then
+		ocf_log err "reset_local_on_unblock_stop is only relevant with action=unblock"
+		exit $OCF_ERR_CONFIGURED
+	fi
+	if [ -z $OCF_RESKEY_tickle_dir ] ; then
+		ocf_log warn "reset_local_on_unblock_stop works best with tickle_dir enabled as well"
+	fi
+  fi
+
   return $OCF_SUCCESS
 }
 
 if
   ( [ $# -ne 1 ] )
 then
   usage
   exit $OCF_ERR_ARGS
 fi
 
 case $1 in
   meta-data)		meta_data
 			exit $OCF_SUCCESS
 			;;
 
   usage)		usage
 			exit $OCF_SUCCESS
 			;;
   *)			;;
 esac
 
 if [ -z "$OCF_RESKEY_protocol" ]; then
   ocf_log err "Please set OCF_RESKEY_protocol"
   exit $OCF_ERR_CONFIGURED
 fi 
 
 if [ -z "$OCF_RESKEY_portno" ]; then
   ocf_log err "Please set OCF_RESKEY_portno"
   exit $OCF_ERR_CONFIGURED
 fi 
 
 if [ -z "$OCF_RESKEY_action" ]; then
   ocf_log err "Please set OCF_RESKEY_action"
   exit $OCF_ERR_CONFIGURED
 fi 
 
 protocol=$OCF_RESKEY_protocol
 portno=$OCF_RESKEY_portno
 action=$OCF_RESKEY_action
 ip=$OCF_RESKEY_ip
+reset_local_on_unblock_stop=$OCF_RESKEY_reset_local_on_unblock_stop
 
 case $1 in
   start)	
 			IptablesStart $protocol $portno $ip $action 
 			;;
 
   stop)		
 			IptablesStop $protocol $portno $ip $action
 			;;
 
   status|monitor)	
 			IptablesStatus $protocol $portno $ip $action
 			;;
 
   validate-all)
 			IptablesValidateAll
 			;;
 
   *)			usage
 			exit $OCF_ERR_UNIMPLEMENTED
 			;;
 esac
 
 exit $?