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        self.userConns = []
+        self.serverConns = None
       ......
    def accept_frp_connection(self,sock, mask):
        frpc_conn, addr = sock.accept()
+        if self.serverConns is None:
+            self.serverConns = frpc_conn
m            frpc_conn.setblocking(False)
m            # 注册为可读套接字
m            sel.register(frpc_conn, selectors.EVENT_READ, self.handle_controller_data)
+        elif addr[0]=='127.0.0.1':
+            frpc_conn.setblocking(False)
+            # 注册为可读套接字
+            sel.register(frpc_conn, selectors.EVENT_READ, self.handle_controller_data)
+        else:
+            print('发现可疑连接:' + str(addr))
+            frpc_conn.close()

frpc_sock.bind(('0.0.0.0', targetport))
OSError: [Errno 98] Address already in use