diff --git a/http.go b/http.go
index 898c0c2..10d259a 100644
--- a/http.go
+++ b/http.go
@@ -24,7 +24,8 @@ type HTTP struct {
 
 	user     string
 	password string
-	xff      bool
+	xff      bool // X-Forwarded-For
+	xsi      bool // X-Server-IP
 
 	selfip string
 }
@@ -47,6 +48,12 @@ func NewHTTP(addr, user, pass, rawQuery string, cDialer Dialer, sDialer Dialer)
 		}
 	}
 
+	if v, ok := p["xsi"]; ok {
+		if v[0] == "true" {
+			s.xsi = true
+		}
+	}
+
 	return s, nil
 }
 
@@ -166,13 +173,8 @@ func (s *HTTP) Serve(c net.Conn) {
 	respHeader.Set("Proxy-Connection", "close")
 	respHeader.Set("Connection", "close")
 
-	if s.xff {
-		if respHeader.Get("X-Forwarded-For") != "" {
-			respHeader.Add("X-Forwarded-For", ",")
-		}
-		respHeader.Add("X-Forwarded-For", rc.RemoteAddr().(*net.TCPAddr).IP.String())
-		respHeader.Add("X-Forwarded-For", ",")
-		respHeader.Add("X-Forwarded-For", s.selfip)
+	if s.xsi {
+		respHeader.Set("X-Server-IP", rc.RemoteAddr().(*net.TCPAddr).IP.String())
 	}
 
 	var respBuf bytes.Buffer
diff --git a/systemd/glider@.service b/systemd/glider@.service
index 399292a..2b7d464 100644
--- a/systemd/glider@.service
+++ b/systemd/glider@.service
@@ -1,6 +1,7 @@
 [Unit]
 Description=Glider Service (%i)
 After=network.target
+Before=iptables.service ip6tables.service
 
 [Service]
 Type=simple
diff --git a/uottun.go b/uottun.go
index a87c886..fcd05e0 100644
--- a/uottun.go
+++ b/uottun.go
@@ -48,24 +48,22 @@ func (s *UoTTun) ListenAndServe() {
 		rc, err := s.sDialer.Dial("uot", s.raddr)
 		if err != nil {
 			logf("proxy-uottun failed to connect to server %v: %v", s.raddr, err)
-			return
+			continue
 		}
 
 		rc.Write(buf[:n])
 
 		// no remote forwarder, just a local udp forwarder
 		if urc, ok := rc.(*net.UDPConn); ok {
-
 			go func() {
 				timedCopy(c, clientAddr, urc, 5*time.Minute, false)
 				urc.Close()
 			}()
-
 		} else { // remote forwarder, udp over tcp
 			resp, err := ioutil.ReadAll(rc)
 			if err != nil {
 				logf("error in ioutil.ReadAll: %s\n", err)
-				return
+				continue
 			}
 			rc.Close()
 			c.WriteTo(resp, clientAddr)