diff --git a/src/conf.c b/src/conf.c
index 738ba664..04049ed5 100644
--- a/src/conf.c
+++ b/src/conf.c
@@ -1477,7 +1477,8 @@ parse_domain_string_common_action(const char *ptr, trusted_domain_t which, int a
 		if (*tmp != '\0' && isblank(*tmp)) {
 			*tmp = '\0';
 		}
-		debug(LOG_DEBUG, "Adding&Delete [%d] trust domain [%s] to&from list", action, hostname);
+
+		debug(LOG_DEBUG, "[%s] trust domain [%s] to&from list", action?"add":"del", hostname);
 		if(action) // 1: add
 			__add_domain_common(hostname, which);
 		else {// 0: del
diff --git a/src/tls_thread.c b/src/tls_thread.c
index ec659314..14567f4a 100755
--- a/src/tls_thread.c
+++ b/src/tls_thread.c
@@ -211,6 +211,7 @@ check_auth_server_available_cb(int errcode, struct evutil_addrinfo *res, void *p
 		mark_auth_server_bad(auth_server);
 		return;
 	}
+	debug(LOG_INFO, "auth server dns resolve success");
 
 	struct evutil_addrinfo *addr = res;
 	for (; addr != NULL; addr = addr->ai_next) {
diff --git a/src/wd_util.c b/src/wd_util.c
index 7c3f6370..0e999d1c 100644
--- a/src/wd_util.c
+++ b/src/wd_util.c
@@ -1441,7 +1441,7 @@ thread_evdns_parse_trusted_domain_2_ip(void *arg)
 		return;
 
 	if (!p) {
-		debug(LOG_DEBUG, "parsed domain list is empty");
+		debug(LOG_DEBUG, "parsed [%s] domain list is empty", which == INNER_TRUSTED_DOMAIN ? "inner" : "user");
 		return;
 	}