diff --git a/trunk/src/app/srs_app_conn.cpp b/trunk/src/app/srs_app_conn.cpp
index 9a6bced53..1dd17b6d1 100644
--- a/trunk/src/app/srs_app_conn.cpp
+++ b/trunk/src/app/srs_app_conn.cpp
@@ -314,6 +314,14 @@ void SrsResourceManager::dispose(ISrsResource* c)
     srs_freep(c);
 }
 
+ISrsStartableConneciton::ISrsStartableConneciton()
+{
+}
+
+ISrsStartableConneciton::~ISrsStartableConneciton()
+{
+}
+
 SrsTcpConnection::SrsTcpConnection(ISrsResourceManager* cm, srs_netfd_t c, string cip, int cport)
 {
     manager = cm;
diff --git a/trunk/src/app/srs_app_conn.hpp b/trunk/src/app/srs_app_conn.hpp
index be45cdad5..fb3933666 100644
--- a/trunk/src/app/srs_app_conn.hpp
+++ b/trunk/src/app/srs_app_conn.hpp
@@ -106,11 +106,20 @@ private:
     void dispose(ISrsResource* c);
 };
 
+// Interface for connection that is startable.
+class ISrsStartableConneciton : virtual public ISrsConnection
+    , virtual public ISrsStartable, virtual public ISrsKbpsDelta
+{
+public:
+    ISrsStartableConneciton();
+    virtual ~ISrsStartableConneciton();
+};
+
 // The basic connection of SRS, for TCP based protocols,
 // all connections accept from listener must extends from this base class,
 // server will add the connection to manager, and delete it when remove.
-class SrsTcpConnection : virtual public ISrsConnection, virtual public ISrsCoroutineHandler
-    , virtual public ISrsKbpsDelta, virtual public ISrsReloadHandler, virtual public ISrsStartable
+class SrsTcpConnection : virtual public ISrsStartableConneciton
+    , virtual public ISrsReloadHandler, virtual public ISrsCoroutineHandler
 {
 protected:
     // Each connection start a green thread,
diff --git a/trunk/src/app/srs_app_server.cpp b/trunk/src/app/srs_app_server.cpp
index 3e9641344..bee1e1bc1 100644
--- a/trunk/src/app/srs_app_server.cpp
+++ b/trunk/src/app/srs_app_server.cpp
@@ -1482,21 +1482,20 @@ srs_error_t SrsServer::accept_client(SrsListenerType type, srs_netfd_t stfd)
 {
     srs_error_t err = srs_success;
     
-    ISrsResource* r = NULL;
+    ISrsStartableConneciton* conn = NULL;
     
-    if ((err = fd_to_resource(type, stfd, &r)) != srs_success) {
+    if ((err = fd_to_resource(type, stfd, &conn)) != srs_success) {
         if (srs_error_code(err) == ERROR_SOCKET_GET_PEER_IP && _srs_config->empty_ip_ok()) {
             srs_close_stfd(stfd); srs_error_reset(err);
             return srs_success;
         }
         return srs_error_wrap(err, "fd to resource");
     }
-    srs_assert(r);
+    srs_assert(conn);
     
     // directly enqueue, the cycle thread will remove the client.
-    conn_manager->add(r);
+    conn_manager->add(conn);
 
-    ISrsStartable* conn = dynamic_cast<ISrsStartable*>(r);
     if ((err = conn->start()) != srs_success) {
         return srs_error_wrap(err, "start conn coroutine");
     }
@@ -1509,7 +1508,7 @@ SrsHttpServeMux* SrsServer::api_server()
     return http_api_mux;
 }
 
-srs_error_t SrsServer::fd_to_resource(SrsListenerType type, srs_netfd_t stfd, ISrsResource** pr)
+srs_error_t SrsServer::fd_to_resource(SrsListenerType type, srs_netfd_t stfd, ISrsStartableConneciton** pr)
 {
     srs_error_t err = srs_success;
     
@@ -1565,7 +1564,7 @@ srs_error_t SrsServer::fd_to_resource(SrsListenerType type, srs_netfd_t stfd, IS
 
 void SrsServer::remove(ISrsResource* c)
 {
-    ISrsKbpsDelta* conn = dynamic_cast<ISrsKbpsDelta*>(c);
+    ISrsStartableConneciton* conn = dynamic_cast<ISrsStartableConneciton*>(c);
 
     SrsStatistic* stat = SrsStatistic::instance();
     stat->kbps_add_delta(c->get_id(), conn);
diff --git a/trunk/src/app/srs_app_server.hpp b/trunk/src/app/srs_app_server.hpp
index b06fd30ba..11315bf35 100644
--- a/trunk/src/app/srs_app_server.hpp
+++ b/trunk/src/app/srs_app_server.hpp
@@ -342,7 +342,7 @@ public:
     // TODO: FIXME: Fetch from hybrid server manager.
     virtual SrsHttpServeMux* api_server();
 private:
-    virtual srs_error_t fd_to_resource(SrsListenerType type, srs_netfd_t stfd, ISrsResource** pr);
+    virtual srs_error_t fd_to_resource(SrsListenerType type, srs_netfd_t stfd, ISrsStartableConneciton** pr);
 // Interface ISrsResourceManager
 public:
     // A callback for connection to remove itself.