diff --git a/common/tls/std_server.go b/common/tls/std_server.go
index 11c78f48..2c875855 100644
--- a/common/tls/std_server.go
+++ b/common/tls/std_server.go
@@ -180,7 +180,7 @@ func NewSTDServer(ctx context.Context, router adapter.Router, logger log.Logger,
 		tlsConfig.ServerName = options.ServerName
 	}
 	if len(options.ALPN) > 0 {
-		tlsConfig.NextProtos = append(tlsConfig.NextProtos, options.ALPN...)
+		tlsConfig.NextProtos = append(options.ALPN, tlsConfig.NextProtos...)
 	}
 	if options.MinVersion != "" {
 		minVersion, err := ParseTLSVersion(options.MinVersion)
diff --git a/transport/v2raygrpc/server.go b/transport/v2raygrpc/server.go
index aadc23d2..7073eb08 100644
--- a/transport/v2raygrpc/server.go
+++ b/transport/v2raygrpc/server.go
@@ -15,6 +15,7 @@ import (
 	M "github.com/sagernet/sing/common/metadata"
 	N "github.com/sagernet/sing/common/network"
 
+	"golang.org/x/net/http2"
 	"google.golang.org/grpc"
 	"google.golang.org/grpc/keepalive"
 	gM "google.golang.org/grpc/metadata"
@@ -32,7 +33,9 @@ type Server struct {
 func NewServer(ctx context.Context, options option.V2RayGRPCOptions, tlsConfig tls.ServerConfig, handler N.TCPConnectionHandler) (*Server, error) {
 	var serverOptions []grpc.ServerOption
 	if tlsConfig != nil {
-		tlsConfig.SetNextProtos([]string{"h2"})
+		if !common.Contains(tlsConfig.NextProtos(), http2.NextProtoTLS) {
+			tlsConfig.SetNextProtos(append([]string{"h2"}, tlsConfig.NextProtos()...))
+		}
 		serverOptions = append(serverOptions, grpc.Creds(NewTLSTransportCredentials(tlsConfig)))
 	}
 	if options.IdleTimeout > 0 {
diff --git a/transport/v2raygrpclite/server.go b/transport/v2raygrpclite/server.go
index c3c62232..2d6687fe 100644
--- a/transport/v2raygrpclite/server.go
+++ b/transport/v2raygrpclite/server.go
@@ -101,8 +101,8 @@ func (s *Server) fallbackRequest(ctx context.Context, writer http.ResponseWriter
 
 func (s *Server) Serve(listener net.Listener) error {
 	if s.tlsConfig != nil {
-		if len(s.tlsConfig.NextProtos()) == 0 {
-			s.tlsConfig.SetNextProtos([]string{http2.NextProtoTLS})
+		if !common.Contains(s.tlsConfig.NextProtos(), http2.NextProtoTLS) {
+			s.tlsConfig.SetNextProtos(append([]string{"h2"}, s.tlsConfig.NextProtos()...))
 		}
 		listener = aTLS.NewListener(listener, s.tlsConfig)
 	}
diff --git a/transport/v2rayhttp/server.go b/transport/v2rayhttp/server.go
index 95588f43..304836ec 100644
--- a/transport/v2rayhttp/server.go
+++ b/transport/v2rayhttp/server.go
@@ -161,6 +161,11 @@ func (s *Server) fallbackRequest(ctx context.Context, writer http.ResponseWriter
 
 func (s *Server) Serve(listener net.Listener) error {
 	if s.tlsConfig != nil {
+		if len(s.tlsConfig.NextProtos()) == 0 {
+			s.tlsConfig.SetNextProtos([]string{http2.NextProtoTLS, "http/1.1"})
+		} else if !common.Contains(s.tlsConfig.NextProtos(), http2.NextProtoTLS) {
+			s.tlsConfig.SetNextProtos(append([]string{"h2"}, s.tlsConfig.NextProtos()...))
+		}
 		listener = aTLS.NewListener(listener, s.tlsConfig)
 	}
 	return s.httpServer.Serve(listener)