diff --git a/common.h b/common.h
index 459fdde..e12f48e 100644
--- a/common.h
+++ b/common.h
@@ -105,7 +105,7 @@ const u32_t client_conn_timeout=10000;
 const u32_t client_conn_uplink_timeout=client_conn_timeout+2000;
 
 //const uint32_t server_conn_timeout=conv_timeout+60000;//this should be 60s+ longer than conv_timeout,so that conv_manager can destruct convs gradually,to avoid latency glicth
-const u32_t server_conn_timeout=conv_timeout+60000;//for test
+const u32_t server_conn_timeout=conv_timeout+20000;//for test
 
 
 extern int about_to_exit;
diff --git a/connection.cpp b/connection.cpp
index c9c982c..7ac7519 100644
--- a/connection.cpp
+++ b/connection.cpp
@@ -313,6 +313,10 @@ int conn_manager_t::clear_inactive0()
 			//mylog(log_info,"[%s:%d]size %d \n",my_ntoa(get_u64_h(it->first)),get_u64_l(it->first),(int)it->second->conv_manager.get_size());
 			it++;
 		}
+		else if(current_time<it->second->last_active_time+server_conn_timeout)
+		{
+			it++;
+		}
 		else
 		{
 			mylog(log_info,"[%s:%d]inactive conn cleared \n",my_ntoa(get_u64_h(it->first)),get_u64_l(it->first));
diff --git a/connection.h b/connection.h
index 289b807..a68e029 100644
--- a/connection.h
+++ b/connection.h
@@ -76,9 +76,14 @@ struct conn_info_t     //stores info for a raw connection.for client ,there is o
 	fec_decode_manager_t fec_decode_manager;
 	my_timer_t timer;
 	ip_port_t ip_port;
+	u64_t last_active_time;
 	conn_info_t()
 	{
 	}
+	void update_active_time()
+	{
+		last_active_time=get_current_time();
+	}
 	conn_info_t(const conn_info_t &b)
 	{
 		assert(0==1);
diff --git a/fec_manager.cpp b/fec_manager.cpp
index 5dc851c..45066e2 100644
--- a/fec_manager.cpp
+++ b/fec_manager.cpp
@@ -252,7 +252,7 @@ int fec_encode_manager_t::input(char *s,int len/*,int &is_first_packet*/)
     		}
 
     	}
-    	mylog(log_info,"%d %d %d\n",actual_data_num,actual_redundant_num,fec_len);
+    	mylog(log_trace,"%d %d %d\n",actual_data_num,actual_redundant_num,fec_len);
 
     	char *tmp_output_buf[max_fec_packet_num+5]={0};
     	for(int i=0;i<actual_data_num+actual_redundant_num;i++)
@@ -301,7 +301,7 @@ int fec_encode_manager_t::input(char *s,int len/*,int &is_first_packet*/)
     	//output_len=blob_len+sizeof(u32_t)+4*sizeof(char);/////remember to change this 4,if modified the protocol
 		rs_encode2(actual_data_num,actual_data_num+actual_redundant_num,tmp_output_buf,fec_len);
 
-		mylog(log_info,"!!! s= %d\n");
+		mylog(log_trace,"!!! s= %d\n");
 
     	ready_for_output=1;
     	seq++;
@@ -412,7 +412,7 @@ int fec_decode_manager_t::input(char *s,int len)
 	int inner_index=(unsigned char)s[tmp_idx++];
 	len=len-tmp_idx;
 
-	mylog(log_info,"input\n");
+	mylog(log_trace,"input\n");
 	if(len<0)
 	{
 		mylog(log_warn,"len<0\n");
diff --git a/main.cpp b/main.cpp
index 2d8dd4a..e2a972a 100644
--- a/main.cpp
+++ b/main.cpp
@@ -553,7 +553,7 @@ int server_event_loop()
 			{
 				uint64_t value;
 				read(timer.get_timer_fd(), &value, 8);
-				///conn_manager.clear_inactive();///////////////////////////remember to uncomment
+				conn_manager.clear_inactive();
 				//conn_info.conv_manager.clear_inactive();
 			}
 			else if (events[idx].data.u64 == (u64_t)local_listen_fd)
@@ -611,10 +611,11 @@ int server_event_loop()
 				}
 				conn_info_t &conn_info=conn_manager.find(ip_port);
 
+				conn_info.update_active_time();
 				int  out_n;char **out_arr;int *out_len;int *out_delay;
 				from_fec_to_normal(conn_info,data,data_len,out_n,out_arr,out_len,out_delay);
 
-				mylog(log_info,"out_n= %d\n",out_n);
+				mylog(log_trace,"out_n= %d\n",out_n);
 				for(int i=0;i<out_n;i++)
 				{
 					u32_t conv;
@@ -727,6 +728,7 @@ int server_event_loop()
 				//conn_info_t* p_conn_info=conn_manager.find_insert_p(ip_port);
 
 				conn_info_t &conn_info=conn_manager.find(ip_port);
+				conn_info.update_active_time();
 
 				int  out_n;char **out_arr;int *out_len;int *out_delay;
 				dest_t dest;