diff --git a/adapter/outbound/snell.go b/adapter/outbound/snell.go
index 40dcf066..d0a26ecc 100644
--- a/adapter/outbound/snell.go
+++ b/adapter/outbound/snell.go
@@ -52,7 +52,7 @@ func streamConn(c net.Conn, option streamOption) *snell.Snell {
 // StreamConn implements C.ProxyAdapter
 func (s *Snell) StreamConn(c net.Conn, metadata *C.Metadata) (net.Conn, error) {
 	c = streamConn(c, streamOption{s.psk, s.version, s.addr, s.obfsOption})
-	port, _ := strconv.Atoi(metadata.DstPort)
+	port, _ := strconv.ParseInt(metadata.DstPort, 10, 16)
 	err := snell.WriteHeader(c, metadata.String(), uint(port), s.version)
 	return c, err
 }
@@ -65,7 +65,7 @@ func (s *Snell) DialContext(ctx context.Context, metadata *C.Metadata, opts ...d
 			return nil, err
 		}
 
-		port, _ := strconv.Atoi(metadata.DstPort)
+		port, _ := strconv.ParseUint(metadata.DstPort, 10, 16)
 		if err = snell.WriteHeader(c, metadata.String(), uint(port), s.version); err != nil {
 			c.Close()
 			return nil, err
diff --git a/adapter/outbound/util.go b/adapter/outbound/util.go
index 0e1d4c8e..b376522f 100644
--- a/adapter/outbound/util.go
+++ b/adapter/outbound/util.go
@@ -21,7 +21,7 @@ func tcpKeepAlive(c net.Conn) {
 func serializesSocksAddr(metadata *C.Metadata) []byte {
 	var buf [][]byte
 	aType := uint8(metadata.AddrType)
-	p, _ := strconv.Atoi(metadata.DstPort)
+	p, _ := strconv.ParseUint(metadata.DstPort, 10, 16)
 	port := []byte{uint8(p >> 8), uint8(p & 0xff)}
 	switch metadata.AddrType {
 	case socks5.AtypDomainName:
diff --git a/adapter/outbound/vmess.go b/adapter/outbound/vmess.go
index 6746eb51..99ea531c 100644
--- a/adapter/outbound/vmess.go
+++ b/adapter/outbound/vmess.go
@@ -353,7 +353,7 @@ func parseVmessAddr(metadata *C.Metadata) *vmess.DstAddr {
 		copy(addr[1:], []byte(metadata.Host))
 	}
 
-	port, _ := strconv.Atoi(metadata.DstPort)
+	port, _ := strconv.ParseUint(metadata.DstPort, 10, 16)
 	return &vmess.DstAddr{
 		UDP:      metadata.NetWork == C.UDP,
 		AddrType: addrType,
diff --git a/component/dialer/bind_others.go b/component/dialer/bind_others.go
index 7f1923aa..e9494673 100644
--- a/component/dialer/bind_others.go
+++ b/component/dialer/bind_others.go
@@ -62,7 +62,7 @@ func bindIfaceToDialer(ifaceName string, dialer *net.Dialer, network string, des
 	if dialer.LocalAddr != nil {
 		_, port, err := net.SplitHostPort(dialer.LocalAddr.String())
 		if err == nil {
-			local, _ = strconv.Atoi(port)
+			local, _ = strconv.ParseInt(port, 10, 16)
 		}
 	}
 
@@ -82,7 +82,7 @@ func bindIfaceToListenConfig(ifaceName string, _ *net.ListenConfig, network, add
 		port = "0"
 	}
 
-	local, _ := strconv.Atoi(port)
+	local, _ := strconv.ParseInt(port, 10, 16)
 
 	addr, err := lookupLocalAddr(ifaceName, network, nil, local)
 	if err != nil {
diff --git a/constant/metadata.go b/constant/metadata.go
index 822b4714..9cc49973 100644
--- a/constant/metadata.go
+++ b/constant/metadata.go
@@ -107,10 +107,10 @@ func (m *Metadata) UDPAddr() *net.UDPAddr {
 	if m.NetWork != UDP || m.DstIP == nil {
 		return nil
 	}
-	port, _ := strconv.Atoi(m.DstPort)
+	port, _ := strconv.ParseInt(m.DstPort, 10, 16)
 	return &net.UDPAddr{
 		IP:   m.DstIP,
-		Port: port,
+		Port: int(port),
 	}
 }
 
diff --git a/rule/port.go b/rule/port.go
index 281a4c4d..b6e8abb1 100644
--- a/rule/port.go
+++ b/rule/port.go
@@ -39,7 +39,7 @@ func (p *Port) ShouldResolveIP() bool {
 }
 
 func NewPort(port string, adapter string, isSource bool) (*Port, error) {
-	_, err := strconv.Atoi(port)
+	_, err := strconv.ParseUint(port, 10, 16)
 	if err != nil {
 		return nil, errPayload
 	}