diff --git a/luci-app-passwall/luasrc/controller/passwall.lua b/luci-app-passwall/luasrc/controller/passwall.lua
index 2409b0dc..cc6c63ca 100644
--- a/luci-app-passwall/luasrc/controller/passwall.lua
+++ b/luci-app-passwall/luasrc/controller/passwall.lua
@@ -301,7 +301,8 @@ function index_status()
 	local e = {}
 	local dns_shunt = uci:get(appname, "@global[0]", "dns_shunt") or "dnsmasq"
 	if dns_shunt == "smartdns" then
-		e.dns_mode_status = luci.sys.call("pidof smartdns >/dev/null") == 0
+		local port = api.get_cache_var("SMARTDNS_LOCAL_PORT") or 0
+		e.dns_mode_status = (port ~= 0) and luci.sys.call(string.format("netstat -apn | grep ':%s ' >/dev/null", port)) == 0 or false
 	elseif dns_shunt == "chinadns-ng" then
 		e.dns_mode_status = luci.sys.call("/bin/busybox top -bn1 | grep -v 'grep' | grep '/tmp/etc/passwall/bin/' | grep 'default' | grep 'chinadns_ng' >/dev/null") == 0
 	else
diff --git a/luci-app-passwall/root/usr/share/passwall/app.sh b/luci-app-passwall/root/usr/share/passwall/app.sh
index 7647f741..d1668ad4 100755
--- a/luci-app-passwall/root/usr/share/passwall/app.sh
+++ b/luci-app-passwall/root/usr/share/passwall/app.sh
@@ -2038,6 +2038,7 @@ get_config() {
 		SMARTDNS_LISTEN_PORT=${NEXT_DNS_LISTEN_PORT}
 		NEXT_DNS_LISTEN_PORT=$(expr $NEXT_DNS_LISTEN_PORT + 1)
 		LOCAL_DNS="127.0.0.1#${SMARTDNS_LOCAL_PORT}"
+		set_cache_var "SMARTDNS_LOCAL_PORT" "${SMARTDNS_LOCAL_PORT}"
 	}
 }