diff --git a/CHANGELOG b/CHANGELOG
index 1bc2e43..4b6cf94 100644
--- a/CHANGELOG
+++ b/CHANGELOG
@@ -1,4 +1,7 @@
-0.6.1 (2013-03-15)
+0.6.3 (not released)
+    * Support IPv6 server
+
+0.6.2 (2013-03-15)
     * Connect to multiple servers in the order specified in config
     * More information in server error log to help error diagnosing
 
diff --git a/cmd/shadowsocks-local/local.go b/cmd/shadowsocks-local/local.go
index 2bbbc11..98b23ad 100644
--- a/cmd/shadowsocks-local/local.go
+++ b/cmd/shadowsocks-local/local.go
@@ -139,7 +139,7 @@ func getRequest(conn net.Conn) (rawaddr []byte, host string, err error) {
 			host = addrIp.String()
 		}
 		port := binary.BigEndian.Uint16(buf[reqLen-2 : reqLen])
-		host += ":" + strconv.Itoa(int(port))
+		host = net.JoinHostPort(host, strconv.Itoa(int(port)))
 	}
 
 	return
@@ -156,6 +156,14 @@ var servers struct {
 }
 
 func parseServerConfig(config *ss.Config) {
+	hasPort := func(s string) bool {
+		_, port, err := net.SplitHostPort(s)
+		if err != nil {
+			return false
+		}
+		return port != ""
+	}
+
 	if len(config.ServerPassword) == 0 {
 		// only one encryption table
 		cipher, err := ss.NewCipher(config.Method, config.Password)
@@ -168,11 +176,11 @@ func parseServerConfig(config *ss.Config) {
 		servers.srvCipher = make([]*ServerCipher, n)
 
 		for i, s := range srvArr {
-			if ss.HasPort(s) {
+			if hasPort(s) {
 				log.Println("ignore server_port option for server", s)
 				servers.srvCipher[i] = &ServerCipher{s, cipher}
 			} else {
-				servers.srvCipher[i] = &ServerCipher{s + ":" + srvPort, cipher}
+				servers.srvCipher[i] = &ServerCipher{net.JoinHostPort(s, srvPort), cipher}
 			}
 		}
 	} else {
@@ -192,8 +200,8 @@ func parseServerConfig(config *ss.Config) {
 			if len(serverInfo) == 3 {
 				encmethod = serverInfo[2]
 			}
-			if !ss.HasPort(server) {
-				log.Fatalf("no port for server %s, please specify port in the form of %s:port\n", server, server)
+			if !hasPort(server) {
+				log.Fatalf("no port for server %s\n", server)
 			}
 			cipher, ok := cipherCache[passwd]
 			if !ok {
diff --git a/script/test.sh b/script/test.sh
index 8263a1c..af92149 100755
--- a/script/test.sh
+++ b/script/test.sh
@@ -5,6 +5,38 @@ LOCAL_PORT="1090"
 SOCKS="127.0.0.1:$LOCAL_PORT"
 
 test_get() {
+    local url
+    url=$1
+    target=$2
+    code=$3
+
+    if [[ -z $code ]]; then
+        code="200"
+    fi
+
+    # get 5 times
+    for i in {1..2}; do
+        # -s silent to disable progress meter, but enable --show-error
+        # -i to include http header
+        # -L to follow redirect so we should always get HTTP 200
+        cont=`curl --socks5 $SOCKS -s --show-error -i -L $url 2>&1`
+        ok=`echo $cont | grep -E -o "HTTP/1\.1 +$code"`
+        html=`echo $cont | grep -E -o -i "$target"`
+        if [[ -z $ok || -z $html ]] ; then
+            echo "=============================="
+            echo "GET $url FAILED!!!"
+            echo "$ok"
+            echo "$html"
+            echo $cont
+            echo "=============================="
+            return 1
+        fi
+        sleep 0.3
+    done
+    return 0
+}
+
+test_shadowsocks() {
     local url
     local method
     local server_pid
@@ -18,27 +50,24 @@ test_get() {
     local_pid=$!
 
     # wait server and client finish startup
-    sleep 0.5
+    sleep 1
 
     # get 5 times
     for i in {1..5}; do
-        if ! curl -s --socks5 $SOCKS $url >/dev/null 2>&1; then
-            echo "=============================="
-            echo "GET $url $method FAILED!!!"
-            echo "=============================="
-            kill -SIGINT $server_pid
-            kill -SIGINT $local_pid
-            exit 1
+        if ! test_get $url "<html"; then
+            kill -SIGTERM $server_pid
+            kill -SIGTERM $local_pid
+            return 1
         fi
     done
     echo "=============================="
     echo "GET $url $method passed"
     echo "=============================="
-    kill -SIGINT $server_pid
-    kill -SIGINT $local_pid
-    sleep 0.5
+    kill -SIGTERM $server_pid
+    kill -SIGTERM $local_pid
+    sleep 1
 }
 
-test_get baidu.com
-test_get baidu.com rc4
+test_shadowsocks baidu.com
+test_shadowsocks baidu.com rc4
 
diff --git a/shadowsocks/conn.go b/shadowsocks/conn.go
index 3a8a5ea..8a23f2d 100644
--- a/shadowsocks/conn.go
+++ b/shadowsocks/conn.go
@@ -6,7 +6,6 @@ import (
 	"fmt"
 	"net"
 	"strconv"
-	"strings"
 )
 
 type Conn struct {
@@ -19,12 +18,11 @@ func NewConn(cn net.Conn, cipher Cipher) *Conn {
 }
 
 func RawAddr(addr string) (buf []byte, err error) {
-	arr := strings.Split(addr, ":")
-	if len(arr) != 2 {
+	host, portStr, err := net.SplitHostPort(addr)
+	if err != nil {
 		return nil, errors.New(
-			fmt.Sprintf("shadowsocks: malformed address %s", addr))
+			fmt.Sprintf("shadowsocks: address error %s %v", addr, err))
 	}
-	host, portStr := arr[0], arr[1]
 	port, err := strconv.Atoi(portStr)
 	if err != nil {
 		return nil, errors.New(
diff --git a/shadowsocks/encrypt_test.go b/shadowsocks/encrypt_test.go
index 484b247..07f4b2c 100644
--- a/shadowsocks/encrypt_test.go
+++ b/shadowsocks/encrypt_test.go
@@ -65,6 +65,7 @@ func TestRC4Cipher(t *testing.T) {
 		t.Error("Should get error for empty key creating rc4 cipher")
 	}
 	cipher, err = NewCipher("rc4", "Alibaba")
+	ciphercopy := cipher.Copy()
 	if err != nil {
 		t.Error("Should not error creating rc4 cipher with key Alibaba")
 	}
@@ -72,5 +73,6 @@ func TestRC4Cipher(t *testing.T) {
 		t.Error("Should get rc4 cipher")
 	} else {
 		testCiphter(t, cipher, "RC4Cipher")
+		testCiphter(t, ciphercopy, "RC4Cipher copy")
 	}
 }
diff --git a/shadowsocks/util.go b/shadowsocks/util.go
index 0b95e7e..eb9396b 100644
--- a/shadowsocks/util.go
+++ b/shadowsocks/util.go
@@ -24,12 +24,3 @@ func IsFileExists(path string) (bool, error) {
 	}
 	return false, err
 }
-
-func HasPort(s string) bool {
-	for i := len(s) - 1; i > 0; i-- {
-		if s[i] == ':' {
-			return true
-		}
-	}
-	return false
-}