diff --git a/common/uot/resolver.go b/common/uot/resolver.go
deleted file mode 100644
index 6c3a7fb..0000000
--- a/common/uot/resolver.go
+++ /dev/null
@@ -1,21 +0,0 @@
-package uot
-
-import (
-	"context"
-	"net"
-	"time"
-)
-
-var LookupAddress func(domain string) (net.IP, error)
-
-func init() {
-	LookupAddress = func(domain string) (net.IP, error) {
-		ctx, cancel := context.WithTimeout(context.Background(), 3*time.Second)
-		ips, err := net.DefaultResolver.LookupIP(ctx, "ip", domain)
-		cancel()
-		if err != nil {
-			return nil, err
-		}
-		return ips[0], nil
-	}
-}
diff --git a/common/uot/server.go b/common/uot/server.go
index 2b61947..f5ff4e8 100644
--- a/common/uot/server.go
+++ b/common/uot/server.go
@@ -48,17 +48,18 @@ func (c *ServerConn) loopInput() {
 	_buffer := buf.StackNew()
 	defer common.KeepAlive(_buffer)
 	buffer := common.Dup(_buffer)
+	defer buffer.Release()
 	for {
 		destination, err := AddrParser.ReadAddrPort(c.inputReader)
 		if err != nil {
 			break
 		}
 		if destination.Family().IsFqdn() {
-			ip, err := LookupAddress(destination.Fqdn)
+			addr, err := net.ResolveUDPAddr("udp", destination.String())
 			if err != nil {
-				break
+				continue
 			}
-			destination.Addr = M.AddrFromIP(ip)
+			destination = M.SocksaddrFromNet(addr)
 		}
 		var length uint16
 		err = binary.Read(c.inputReader, binary.BigEndian, &length)
@@ -82,6 +83,7 @@ func (c *ServerConn) loopOutput() {
 	_buffer := buf.StackNew()
 	defer common.KeepAlive(_buffer)
 	buffer := common.Dup(_buffer)
+	defer buffer.Release()
 	for {
 		buffer.FullReset()
 		n, addr, err := buffer.ReadPacketFrom(c)
diff --git a/protocol/socks/packet.go b/protocol/socks/packet.go
index 5e55c8c..374b0a6 100644
--- a/protocol/socks/packet.go
+++ b/protocol/socks/packet.go
@@ -58,6 +58,7 @@ func (c *AssociateConn) WriteTo(p []byte, addr net.Addr) (n int, err error) {
 	_buffer := buf.StackNew()
 	defer common.KeepAlive(_buffer)
 	buffer := common.Dup(_buffer)
+	defer buffer.Release()
 	common.Must(buffer.WriteZeroN(3))
 	err = M.SocksaddrSerializer.WriteAddrPort(buffer, M.SocksaddrFromNet(addr))
 	if err != nil {
@@ -81,6 +82,7 @@ func (c *AssociateConn) Write(b []byte) (n int, err error) {
 	_buffer := buf.StackNew()
 	defer common.KeepAlive(_buffer)
 	buffer := common.Dup(_buffer)
+	defer buffer.Release()
 	common.Must(buffer.WriteZeroN(3))
 	err = M.SocksaddrSerializer.WriteAddrPort(buffer, c.dest)
 	if err != nil {
@@ -150,6 +152,7 @@ func (c *AssociatePacketConn) WriteTo(p []byte, addr net.Addr) (n int, err error
 	_buffer := buf.StackNew()
 	defer common.KeepAlive(_buffer)
 	buffer := common.Dup(_buffer)
+	defer buffer.Release()
 	common.Must(buffer.WriteZeroN(3))
 
 	err = M.SocksaddrSerializer.WriteAddrPort(buffer, M.SocksaddrFromNet(addr))
@@ -173,6 +176,7 @@ func (c *AssociatePacketConn) Write(b []byte) (n int, err error) {
 	_buffer := buf.StackNew()
 	defer common.KeepAlive(_buffer)
 	buffer := common.Dup(_buffer)
+	defer buffer.Release()
 	common.Must(buffer.WriteZeroN(3))
 
 	err = M.SocksaddrSerializer.WriteAddrPort(buffer, c.dest)