diff --git a/adapters/outbound/http.go b/adapters/outbound/http.go
index 77b835b6..9dc4cf49 100644
--- a/adapters/outbound/http.go
+++ b/adapters/outbound/http.go
@@ -45,7 +45,7 @@ func (h *Http) DialContext(ctx context.Context, metadata *C.Metadata) (C.Conn, e
 	}
 
 	if err != nil {
-		return nil, fmt.Errorf("%s connect error", h.addr)
+		return nil, fmt.Errorf("%s connect error: %w", h.addr, err)
 	}
 	tcpKeepAlive(c)
 	if err := h.shakeHand(metadata, c); err != nil {
diff --git a/adapters/outbound/shadowsocks.go b/adapters/outbound/shadowsocks.go
index 22d160ba..091f6f37 100644
--- a/adapters/outbound/shadowsocks.go
+++ b/adapters/outbound/shadowsocks.go
@@ -61,7 +61,7 @@ type v2rayObfsOption struct {
 func (ss *ShadowSocks) DialContext(ctx context.Context, metadata *C.Metadata) (C.Conn, error) {
 	c, err := dialContext(ctx, "tcp", ss.server)
 	if err != nil {
-		return nil, fmt.Errorf("%s connect error: %s", ss.server, err.Error())
+		return nil, fmt.Errorf("%s connect error: %w", ss.server, err)
 	}
 	tcpKeepAlive(c)
 	switch ss.obfsMode {
@@ -74,7 +74,7 @@ func (ss *ShadowSocks) DialContext(ctx context.Context, metadata *C.Metadata) (C
 		var err error
 		c, err = v2rayObfs.NewV2rayObfs(c, ss.v2rayOption)
 		if err != nil {
-			return nil, fmt.Errorf("%s connect error: %s", ss.server, err.Error())
+			return nil, fmt.Errorf("%s connect error: %w", ss.server, err)
 		}
 	}
 	c = ss.cipher.StreamConn(c)
@@ -95,7 +95,7 @@ func (ss *ShadowSocks) DialUDP(metadata *C.Metadata) (C.PacketConn, net.Addr, er
 
 	targetAddr := socks5.ParseAddr(metadata.RemoteAddress())
 	if targetAddr == nil {
-		return nil, nil, fmt.Errorf("parse address error: %v:%v", metadata.String(), metadata.DstPort)
+		return nil, nil, fmt.Errorf("parse address %s error: %s", metadata.String(), metadata.DstPort)
 	}
 
 	pc = ss.cipher.PacketConn(pc)
@@ -114,7 +114,7 @@ func NewShadowSocks(option ShadowSocksOption) (*ShadowSocks, error) {
 	password := option.Password
 	ciph, err := core.PickCipher(cipher, nil, password)
 	if err != nil {
-		return nil, fmt.Errorf("ss %s initialize error: %s", server, err.Error())
+		return nil, fmt.Errorf("ss %s initialize error: %w", server, err)
 	}
 
 	var v2rayOption *v2rayObfs.Option
@@ -136,7 +136,7 @@ func NewShadowSocks(option ShadowSocksOption) (*ShadowSocks, error) {
 	if option.Plugin == "obfs" {
 		opts := simpleObfsOption{Host: "bing.com"}
 		if err := decoder.Decode(option.PluginOpts, &opts); err != nil {
-			return nil, fmt.Errorf("ss %s initialize obfs error: %s", server, err.Error())
+			return nil, fmt.Errorf("ss %s initialize obfs error: %w", server, err)
 		}
 
 		if opts.Mode != "tls" && opts.Mode != "http" {
@@ -147,7 +147,7 @@ func NewShadowSocks(option ShadowSocksOption) (*ShadowSocks, error) {
 	} else if option.Plugin == "v2ray-plugin" {
 		opts := v2rayObfsOption{Host: "bing.com", Mux: true}
 		if err := decoder.Decode(option.PluginOpts, &opts); err != nil {
-			return nil, fmt.Errorf("ss %s initialize v2ray-plugin error: %s", server, err.Error())
+			return nil, fmt.Errorf("ss %s initialize v2ray-plugin error: %w", server, err)
 		}
 
 		if opts.Mode != "websocket" {
diff --git a/adapters/outbound/snell.go b/adapters/outbound/snell.go
index 6b95aace..ecc0a685 100644
--- a/adapters/outbound/snell.go
+++ b/adapters/outbound/snell.go
@@ -30,7 +30,7 @@ type SnellOption struct {
 func (s *Snell) DialContext(ctx context.Context, metadata *C.Metadata) (C.Conn, error) {
 	c, err := dialContext(ctx, "tcp", s.server)
 	if err != nil {
-		return nil, fmt.Errorf("%s connect error: %s", s.server, err.Error())
+		return nil, fmt.Errorf("%s connect error: %w", s.server, err)
 	}
 	tcpKeepAlive(c)
 	switch s.obfsOption.Mode {
@@ -53,7 +53,7 @@ func NewSnell(option SnellOption) (*Snell, error) {
 	decoder := structure.NewDecoder(structure.Option{TagName: "obfs", WeaklyTypedInput: true})
 	obfsOption := &simpleObfsOption{Host: "bing.com"}
 	if err := decoder.Decode(option.ObfsOpts, obfsOption); err != nil {
-		return nil, fmt.Errorf("snell %s initialize obfs error: %s", server, err.Error())
+		return nil, fmt.Errorf("snell %s initialize obfs error: %w", server, err)
 	}
 
 	if obfsOption.Mode != "tls" && obfsOption.Mode != "http" {
diff --git a/adapters/outbound/socks5.go b/adapters/outbound/socks5.go
index 9355cff1..6551df17 100644
--- a/adapters/outbound/socks5.go
+++ b/adapters/outbound/socks5.go
@@ -44,7 +44,7 @@ func (ss *Socks5) DialContext(ctx context.Context, metadata *C.Metadata) (C.Conn
 	}
 
 	if err != nil {
-		return nil, fmt.Errorf("%s connect error", ss.addr)
+		return nil, fmt.Errorf("%s connect error: %w", ss.addr, err)
 	}
 	tcpKeepAlive(c)
 	var user *socks5.User
@@ -65,7 +65,7 @@ func (ss *Socks5) DialUDP(metadata *C.Metadata) (_ C.PacketConn, _ net.Addr, err
 	defer cancel()
 	c, err := dialContext(ctx, "tcp", ss.addr)
 	if err != nil {
-		err = fmt.Errorf("%s connect error", ss.addr)
+		err = fmt.Errorf("%s connect error: %w", ss.addr, err)
 		return
 	}
 
@@ -92,7 +92,7 @@ func (ss *Socks5) DialUDP(metadata *C.Metadata) (_ C.PacketConn, _ net.Addr, err
 
 	bindAddr, err := socks5.ClientHandshake(c, serializesSocksAddr(metadata), socks5.CmdUDPAssociate, user)
 	if err != nil {
-		err = fmt.Errorf("%v client hanshake error", err)
+		err = fmt.Errorf("client hanshake error: %w", err)
 		return
 	}
 
@@ -103,7 +103,7 @@ func (ss *Socks5) DialUDP(metadata *C.Metadata) (_ C.PacketConn, _ net.Addr, err
 
 	targetAddr := socks5.ParseAddr(metadata.RemoteAddress())
 	if targetAddr == nil {
-		return nil, nil, fmt.Errorf("parse address error: %v:%v", metadata.String(), metadata.DstPort)
+		return nil, nil, fmt.Errorf("parse address %s error: %s", metadata.String(), metadata.DstPort)
 	}
 
 	pc, err := net.ListenPacket("udp", "")