From a51d64a102d672de453977bb93bb9f7c677c17e3 Mon Sep 17 00:00:00 2001
From: V2Ray <admin@v2ray.com>
Date: Mon, 21 Sep 2015 17:28:48 +0200
Subject: [PATCH] More information when vmess auth fails.

---
 common/log/log.go       | 2 +-
 proxy/vmess/vmessout.go | 5 +++++
 2 files changed, 6 insertions(+), 1 deletion(-)

diff --git a/common/log/log.go b/common/log/log.go
index c7c478d1b..1c301c5b5 100644
--- a/common/log/log.go
+++ b/common/log/log.go
@@ -31,7 +31,7 @@ func writeLog(level LogLevel, prefix, format string, v ...interface{}) string {
 	} else {
 		data = fmt.Sprintf(format, v...)
 	}
-	log.Print(prefix + data)
+	log.Println(prefix + data)
 	return data
 }
 
diff --git a/proxy/vmess/vmessout.go b/proxy/vmess/vmessout.go
index d51dbc1f3..dbbec1a1f 100644
--- a/proxy/vmess/vmessout.go
+++ b/proxy/vmess/vmessout.go
@@ -15,6 +15,10 @@ import (
 	"github.com/v2ray/v2ray-core/proxy/vmess/protocol/user"
 )
 
+const (
+	InfoTimeNotSync = "Please check the User ID in your vmess configuration, and make sure the time on your local and remote server are in sync."
+)
+
 // VNext is the next Point server in the connection chain.
 type VNextServer struct {
 	Destination v2net.Destination // Address of VNext server
@@ -145,6 +149,7 @@ func handleResponse(conn *net.TCPConn, request *protocol.VMessRequest, output ch
 	nBytes, err := decryptResponseReader.Read(response[:])
 	if err != nil {
 		log.Error("VMessOut: Failed to read VMess response (%d bytes): %v", nBytes, err)
+		log.Error(InfoTimeNotSync)
 		return
 	}
 	if !bytes.Equal(response[:], request.ResponseHeader[:]) {