diff --git a/cmd/gost/peer.go b/cmd/gost/peer.go
index 4ed2e45..e2cb495 100644
--- a/cmd/gost/peer.go
+++ b/cmd/gost/peer.go
@@ -57,10 +57,13 @@ func (cfg *peerConfig) Reload(r io.Reader) error {
 	group := cfg.group
 	group.SetSelector(
 		nil,
-		gost.WithFilter(&gost.FailFilter{
-			MaxFails:    cfg.MaxFails,
-			FailTimeout: cfg.FailTimeout,
-		}),
+		gost.WithFilter(
+			&gost.FailFilter{
+				MaxFails:    cfg.MaxFails,
+				FailTimeout: cfg.FailTimeout,
+			},
+			&gost.InvalidFilter{},
+		),
 		gost.WithStrategy(gost.NewStrategy(cfg.Strategy)),
 	)
 
diff --git a/cmd/gost/route.go b/cmd/gost/route.go
index 7ececfb..cdbc0ed 100644
--- a/cmd/gost/route.go
+++ b/cmd/gost/route.go
@@ -52,10 +52,13 @@ func (r *route) parseChain() (*gost.Chain, error) {
 		ngroup.AddNode(nodes...)
 
 		ngroup.SetSelector(nil,
-			gost.WithFilter(&gost.FailFilter{
-				MaxFails:    defaultMaxFails,
-				FailTimeout: defaultFailTimeout,
-			}),
+			gost.WithFilter(
+				&gost.FailFilter{
+					MaxFails:    defaultMaxFails,
+					FailTimeout: defaultFailTimeout,
+				},
+				&gost.InvalidFilter{},
+			),
 			gost.WithStrategy(gost.NewStrategy(nodes[0].Get("strategy"))),
 		)
 
diff --git a/selector.go b/selector.go
index cb678fd..10efa04 100644
--- a/selector.go
+++ b/selector.go
@@ -3,6 +3,8 @@ package gost
 import (
 	"errors"
 	"math/rand"
+	"net"
+	"strconv"
 	"sync"
 	"sync/atomic"
 	"time"
@@ -167,7 +169,7 @@ type FailFilter struct {
 	FailTimeout time.Duration
 }
 
-// Filter filters nodes.
+// Filter filters dead nodes.
 func (f *FailFilter) Filter(nodes []Node) []Node {
 	if len(nodes) <= 1 || f.MaxFails <= 0 {
 		return nodes
@@ -188,6 +190,26 @@ func (f *FailFilter) String() string {
 	return "fail"
 }
 
+// InvalidFilter filters the invalid node.
+// A node is invalid if its port is invalid (negative or zero value).
+type InvalidFilter struct{}
+
+// Filter filters invalid nodes.
+func (f *InvalidFilter) Filter(nodes []Node) []Node {
+	nl := []Node{}
+	for i := range nodes {
+		_, sport, _ := net.SplitHostPort(nodes[i].Addr)
+		if port, _ := strconv.Atoi(sport); port > 0 {
+			nl = append(nl, nodes[i])
+		}
+	}
+	return nl
+}
+
+func (f *InvalidFilter) String() string {
+	return "invalid"
+}
+
 type failMarker struct {
 	failTime  int64
 	failCount uint32