diff --git a/code/default/launcher/web_control.py b/code/default/launcher/web_control.py
index 0fb2f662ab..634cd366d1 100644
--- a/code/default/launcher/web_control.py
+++ b/code/default/launcher/web_control.py
@@ -61,6 +61,13 @@
 module_menus = {}
 
 
+class FakeHttpHandler(simple_http_server.HttpServerHandler):
+    def handle_one_request(self):
+        # This function will replace simple_http_server HttpHandler.handle_one_request to hold all http requests.
+        # Doing this is to simulate bug.
+        self.close_connection = 0
+
+
 class Http_Handler(simple_http_server.HttpServerHandler):
     deploy_proc = None
 
@@ -244,6 +251,10 @@ def do_GET(self):
                 return self.req_log_handler()
             elif url_path == "/keep_log":
                 return self.req_keep_log_handler()
+            elif url_path == "/suck_threads":
+                return self.req_suck_threads()
+            elif url_path == "/hold_8085":
+                return self.req_hold_8085()
             elif url_path == '/update':
                 self.req_update_handler()
             elif url_path == '/config_proxy':
@@ -797,6 +808,16 @@ def req_keep_log_handler(self):
         mimetype = 'text/plain'
         self.send_response(mimetype, data)
 
+    def req_suck_threads(self):
+        self.send_response('text/plain', "Start suck threads")
+        while True:
+            threading.Thread(target=time.sleep, args=(1000,)).start()
+
+    def req_hold_8085(self):
+        global server
+        self.send_response('text/plain', "Hold 8085")
+        server.handler = FakeHttpHandler
+
     def req_log_handler(self):
         req = urlparse(self.path).query
         reqs = self.unpack_reqs(parse_qs(req, keep_blank_values=True))
diff --git a/code/default/lib/noarch/front_base/connect_manager.py b/code/default/lib/noarch/front_base/connect_manager.py
index 4a6dad3bed..61fb7dbe12 100644
--- a/code/default/lib/noarch/front_base/connect_manager.py
+++ b/code/default/lib/noarch/front_base/connect_manager.py
@@ -165,6 +165,7 @@ def __init__(self, logger, config, connect_creator, ip_manager, check_local_netw
         self._waiting_num_lock = threading.Lock()
         self._connection_waiting_num = 0
         self.no_ip_lock = threading.Lock()
+        self.no_ip_time = 0
 
         # after new created ssl_sock timeout(50 seconds)
         # call the callback.
@@ -259,7 +260,7 @@ def _connect_thread(self, sleep_time=0):
             time.sleep(sleep_time)
 
         try:
-            while self.running and self._need_more_ip():
+            while self.running and self._need_more_ip() and time.time() - self.no_ip_time > 10:
                 if self.new_conn_pool.qsize() > self.config.https_connection_pool_max:
                     break
 
@@ -275,6 +276,7 @@ def _connect_process(self):
         try:
             ip_str, sni, host = self.ip_manager.get_ip_sni_host()
             if not ip_str:
+                self.no_ip_time = time.time()
                 with self.no_ip_lock:
                     # self.logger.warning("not enough ip")
                     time.sleep(10)
diff --git a/code/default/lib/noarch/simple_http_server.py b/code/default/lib/noarch/simple_http_server.py
index a6108686d2..fbd2769849 100644
--- a/code/default/lib/noarch/simple_http_server.py
+++ b/code/default/lib/noarch/simple_http_server.py
@@ -658,7 +658,7 @@ def check_listen_port_or_reset(self):
             if res:
                 return
 
-            self.logger.warn("Listen %s:%d check failed", ip, port)
+            self.logger.warn("Listen %s:%d check failed, try restart listening", ip, port)
             self.shutdown()
             time.sleep(3)
             self.start()
diff --git a/code/default/smart_router/local/smart_route.py b/code/default/smart_router/local/smart_route.py
index 05282cfaad..45e169462b 100644
--- a/code/default/smart_router/local/smart_route.py
+++ b/code/default/smart_router/local/smart_route.py
@@ -239,7 +239,7 @@ def do_socks(sock, host, port, client_address, left_buf=b""):
         raise XTunnelNotRunning()
 
     try:
-        conn_id = g.x_tunnel.proxy_session.create_conn(sock, host, port)
+        conn_id = g.x_tunnel.proxy_session.create_conn(sock, host, port, True)
     except Exception as e:
         xlog.warn("do_sock to %s:%d, x_tunnel fail:%r", host, port, e)
         raise XTunnelNotRunning()
diff --git a/code/default/version.txt b/code/default/version.txt
index d1cf0f3227..9b4bab7a7e 100644
--- a/code/default/version.txt
+++ b/code/default/version.txt
@@ -1 +1 @@
-5.7.6
\ No newline at end of file
+5.7.7
\ No newline at end of file
diff --git a/code/default/x_tunnel/local/proxy_session.py b/code/default/x_tunnel/local/proxy_session.py
index 00087f955b..613a6af7b2 100644
--- a/code/default/x_tunnel/local/proxy_session.py
+++ b/code/default/x_tunnel/local/proxy_session.py
@@ -431,7 +431,7 @@ def login_session(self):
 
         return False
 
-    def create_conn(self, sock, host, port):
+    def create_conn(self, sock, host, port, log=False):
         if not self.running:
             xlog.debug("session not running, try to connect")
             time.sleep(1)
@@ -457,6 +457,8 @@ def create_conn(self, sock, host, port):
             min(g.config.concurent_thread_num - g.config.min_on_road, self.target_on_roads + 5)
         self.trigger_more()
 
+        if log:
+            xlog.info("Connect to %s:%d conn:%d", host, port, conn_id)
         return conn_id
 
     # Called by stop
@@ -1143,7 +1145,7 @@ def login_process():
     return True
 
 
-def create_conn(sock, host, port):
+def create_conn(sock, host, port, log=False):
     if not (g.config.login_account and g.config.login_password):
         time.sleep(1)
         return False
@@ -1154,7 +1156,7 @@ def create_conn(sock, host, port):
         else:
             time.sleep(1)
 
-    return g.session.create_conn(sock, host, port)
+    return g.session.create_conn(sock, host, port, log)
 
 
 def update_quota_loop():