diff --git a/transport/internet/kcp/connection.go b/transport/internet/kcp/connection.go
index 42d24710f..6ea411ac2 100644
--- a/transport/internet/kcp/connection.go
+++ b/transport/internet/kcp/connection.go
@@ -331,7 +331,7 @@ func (this *Connection) updateTask() {
 	this.Terminate()
 }
 
-func (this *Connection) FetchInputFrom(conn net.Conn) {
+func (this *Connection) FetchInputFrom(conn io.Reader) {
 	go func() {
 		payload := alloc.NewBuffer()
 		defer payload.Release()
@@ -344,8 +344,6 @@ func (this *Connection) FetchInputFrom(conn net.Conn) {
 			payload.Slice(0, nBytes)
 			if this.block.Open(payload) {
 				this.Input(payload.Value)
-			} else {
-				log.Info("KCP|Connection: Invalid response from ", conn.RemoteAddr())
 			}
 		}
 	}()
diff --git a/transport/internet/kcp/connection_test.go b/transport/internet/kcp/connection_test.go
index 36643f723..e53d67502 100644
--- a/transport/internet/kcp/connection_test.go
+++ b/transport/internet/kcp/connection_test.go
@@ -1,17 +1,31 @@
 package kcp_test
 
 import (
+	"crypto/rand"
+	"io"
+	"net"
 	"testing"
 	"time"
 
+	v2net "github.com/v2ray/v2ray-core/common/net"
 	"github.com/v2ray/v2ray-core/testing/assert"
 	. "github.com/v2ray/v2ray-core/transport/internet/kcp"
 )
 
+type NoOpWriteCloser struct{}
+
+func (this *NoOpWriteCloser) Write(b []byte) (int, error) {
+	return len(b), nil
+}
+
+func (this *NoOpWriteCloser) Close() error {
+	return nil
+}
+
 func TestConnectionReadTimeout(t *testing.T) {
 	assert := assert.On(t)
 
-	conn := NewConnection(1, nil, nil, nil, NewSimpleAuthenticator())
+	conn := NewConnection(1, &NoOpWriteCloser{}, nil, nil, NewSimpleAuthenticator())
 	conn.SetReadDeadline(time.Now().Add(time.Second))
 
 	b := make([]byte, 1024)
@@ -19,3 +33,32 @@ func TestConnectionReadTimeout(t *testing.T) {
 	assert.Int(nBytes).Equals(0)
 	assert.Error(err).IsNotNil()
 }
+
+func TestConnectionReadWrite(t *testing.T) {
+	assert := assert.On(t)
+
+	upReader, upWriter := io.Pipe()
+	downReader, downWriter := io.Pipe()
+
+	connClient := NewConnection(1, upWriter, &net.UDPAddr{IP: v2net.LocalHostIP.IP(), Port: 1}, &net.UDPAddr{IP: v2net.LocalHostIP.IP(), Port: 2}, NewSimpleAuthenticator())
+	go connClient.FetchInputFrom(downReader)
+
+	connServer := NewConnection(1, downWriter, &net.UDPAddr{IP: v2net.LocalHostIP.IP(), Port: 2}, &net.UDPAddr{IP: v2net.LocalHostIP.IP(), Port: 1}, NewSimpleAuthenticator())
+	go connServer.FetchInputFrom(upReader)
+
+	totalWritten := 1024 * 1024
+	clientSend := make([]byte, totalWritten)
+	rand.Read(clientSend)
+	nBytes, err := connClient.Write(clientSend)
+	assert.Int(nBytes).Equals(totalWritten)
+	assert.Error(err).IsNil()
+
+	serverReceived := make([]byte, totalWritten)
+	totalRead := 0
+	for totalRead < totalWritten {
+		nBytes, err = connServer.Read(serverReceived[totalRead:])
+		assert.Error(err).IsNil()
+		totalRead += nBytes
+	}
+	assert.Bytes(serverReceived).Equals(clientSend)
+}