diff --git a/blockcheck.sh b/blockcheck.sh
index ad47fd8..39d84c3 100755
--- a/blockcheck.sh
+++ b/blockcheck.sh
@@ -348,6 +348,26 @@ check_system()
 	echo firewall type is $FWTYPE
 }
 
+zp_already_running()
+{
+	case "$UNAME" in
+		CYGWIN)
+			win_process_exists $PKTWSD || win_process_exists goodbyedpi
+			;;
+		*)
+			process_exists $PKTWSD || process_exists tpws
+	esac
+}
+check_already()
+{
+	echo \* checking already running zapret processes
+	if zp_already_running; then
+		echo "!!! WARNING. some dpi bypass processes already running !!!"
+		echo "!!! WARNING. blockcheck requires all DPI bypass methods disabled !!!"
+		echo "!!! WARNING. pls stop all dpi bypass instances that may interfere with blockcheck !!!"
+	fi
+}
+
 freebsd_module_loaded()
 {
 	# $1 - module name
@@ -885,17 +905,17 @@ tpws_curl_test()
 	# $1 - test function
 	# $2 - domain
 	# $3,$4,$5, ... - tpws params
-	echo - checking tpws $3 $4 $5 $6 $7 $8 $9 $TPWS_EXTRA
+	echo - checking tpws $3 $4 $5 $6 $7 $8 $9 $TPWS_EXTRA "$TPWS_EXTRA_1" "$TPWS_EXTRA_2" "$TPWS_EXTRA_3" "$TPWS_EXTRA_4" "$TPWS_EXTRA_5" "$TPWS_EXTRA_6" "$TPWS_EXTRA_7" "$TPWS_EXTRA_8" "$TPWS_EXTRA_9"
 	local ALL_PROXY="socks5://127.0.0.1:$SOCKS_PORT"
-	ws_curl_test tpws_start "$@" $TPWS_EXTRA
+	ws_curl_test tpws_start "$@" $TPWS_EXTRA "$TPWS_EXTRA_1" "$TPWS_EXTRA_2" "$TPWS_EXTRA_3" "$TPWS_EXTRA_4" "$TPWS_EXTRA_5" "$TPWS_EXTRA_6" "$TPWS_EXTRA_7" "$TPWS_EXTRA_8" "$TPWS_EXTRA_9"
 }
 pktws_curl_test()
 {
 	# $1 - test function
 	# $2 - domain
 	# $3,$4,$5, ... - nfqws/dvtws params
-	echo - checking $PKTWSD ${WF:+$WF }$3 $4 $5 $6 $7 $8 $9 $PKTWS_EXTRA
-	ws_curl_test pktws_start "$@" $PKTWS_EXTRA
+	echo - checking $PKTWSD ${WF:+$WF }$3 $4 $5 $6 $7 $8 $9 $PKTWS_EXTRA "$PKTWS_EXTRA_1" "$PKTWS_EXTRA_2" "$PKTWS_EXTRA_3" "$PKTWS_EXTRA_4" "$PKTWS_EXTRA_5" "$PKTWS_EXTRA_6" "$PKTWS_EXTRA_7" "$PKTWS_EXTRA_8" "$PKTWS_EXTRA_9"
+	ws_curl_test pktws_start "$@" $PKTWS_EXTRA "$PKTWS_EXTRA_1" "$PKTWS_EXTRA_2" "$PKTWS_EXTRA_3" "$PKTWS_EXTRA_4" "$PKTWS_EXTRA_5" "$PKTWS_EXTRA_6" "$PKTWS_EXTRA_7" "$PKTWS_EXTRA_8" "$PKTWS_EXTRA_9"
 }
 xxxws_curl_test_update()
 {
@@ -1796,6 +1816,7 @@ sigsilent()
 fsleep_setup
 fix_sbin_path
 check_system
+check_already
 [ "$UNAME" = CYGWIN ] || require_root
 check_prerequisites
 trap sigint_cleanup INT
diff --git a/common/base.sh b/common/base.sh
index cdfc7d9..7c772ef 100644
--- a/common/base.sh
+++ b/common/base.sh
@@ -313,6 +313,22 @@ shell_name()
 	}
 }
 
+process_exists()
+{
+	if exists pgrep; then
+		pgrep ^$1$ >/dev/null
+	elif exists pidof; then
+		pidof $1 >/dev/null
+	else
+		return 1
+	fi 
+}
+
+win_process_exists()
+{
+	tasklist /NH /FI "IMAGENAME eq ${1}.exe" | grep -q "^${1}.exe"
+}
+
 std_ports()
 {
         HTTP_PORTS=${HTTP_PORTS:-80}
diff --git a/init.d/openwrt/zapret b/init.d/openwrt/zapret
index 208dc67..46cd10b 100755
--- a/init.d/openwrt/zapret
+++ b/init.d/openwrt/zapret
@@ -185,7 +185,8 @@ start_daemons()
 }
 stop_daemons()
 {
-	procd_kill "$(basename ${basescript:-$initscript})" "$1"
+	local svc="$(basename ${basescript:-$initscript})"
+	procd_running "$svc" "$1" && procd_kill "$svc" "$1"
 }
 restart_daemons()
 {