diff --git a/src/dns_client.c b/src/dns_client.c
index 4dfad45..f71330e 100644
--- a/src/dns_client.c
+++ b/src/dns_client.c
@@ -246,6 +246,31 @@ static LIST_HEAD(pending_servers);
 static pthread_mutex_t pending_server_mutex = PTHREAD_MUTEX_INITIALIZER;
 static int dns_client_has_bootstrap_dns = 0;
 
+const char *_dns_server_get_type_string(dns_server_type_t type) 
+{
+	const char *type_str = "";
+
+	switch (type)
+	{
+	case DNS_SERVER_UDP:
+		type_str = "udp";
+		break;
+	case DNS_SERVER_TCP:
+		type_str = "tcp";
+		break;
+	case DNS_SERVER_TLS:
+		type_str = "tls";
+		break;
+	case DNS_SERVER_HTTPS:
+		type_str = "https";
+		break;
+	default:
+		break;
+	}
+
+	return type_str;
+}
+
 /* get addr info */
 static struct addrinfo *_dns_client_getaddr(const char *host, char *port, int type, int protocol)
 {
@@ -823,6 +848,8 @@ static int _dns_client_server_add(char *server_ip, char *server_host, int port,
 	atomic_inc(&client.dns_server_num);
 	freeaddrinfo(gai);
 
+	tlog(TLOG_INFO, "add server %s:%d, type: %s", server_ip, port, _dns_server_get_type_string(server_info->type));
+
 	return 0;
 errout:
 	if (server_info) {
@@ -1753,8 +1780,10 @@ static int _dns_client_process_tcp_buff(struct dns_server_info *server_info)
 			}
 
 			if (http_head_get_httpcode(http_head) != 200) {
-				tlog(TLOG_WARN, "http server query failed, server return http code : %d, %s", http_head_get_httpcode(http_head),
-					 http_head_get_httpcode_msg(http_head));
+				tlog(TLOG_WARN, "http server query from %s:%d failed, server return http code : %d, %s", 
+					server_info->ip, server_info->port,
+					http_head_get_httpcode(http_head),
+					http_head_get_httpcode_msg(http_head));
 				goto errout;
 			}
 
@@ -1829,7 +1858,7 @@ static int _dns_client_process_tcp(struct dns_server_info *server_info, struct e
 				goto errout;
 			}
 
-			tlog(TLOG_ERROR, "recv failed, server %s, %s\n", server_info->ip, strerror(errno));
+			tlog(TLOG_ERROR, "recv failed, server %s:%d, %s\n", server_info->ip, server_info->port, strerror(errno));
 			goto errout;
 		}
 
diff --git a/src/dns_server.c b/src/dns_server.c
index a7ad33e..4745683 100644
--- a/src/dns_server.c
+++ b/src/dns_server.c
@@ -1721,7 +1721,12 @@ static void _dns_server_update_rule_by_flags(struct dns_request *request)
 {
 	struct dns_rule_flags *rule_flag =
 		(struct dns_rule_flags *)request->domain_rule.rules[0];
-	unsigned flags = rule_flag->flags;
+	unsigned int flags = 0;
+
+	if (rule_flag == NULL) {
+		return;
+	}
+	flags = rule_flag->flags;
 
 	if (flags & DOMAIN_FLAG_ADDR_IGN) {
 		request->domain_rule.rules[DOMAIN_RULE_ADDRESS_IPV4] = NULL;
diff --git a/src/tlog.h b/src/tlog.h
index 35c7d44..3577f95 100644
--- a/src/tlog.h
+++ b/src/tlog.h
@@ -24,12 +24,12 @@ typedef enum {
 
 struct tlog_time {
     int year;
+    unsigned int usec;
     unsigned char mon;
     unsigned char mday;
     unsigned char hour;
     unsigned char min;
     unsigned char sec;
-    unsigned char usec;
 } __attribute__((packed));
 
 #ifndef TLOG_MAX_LINE_LEN