diff --git a/trunk/conf/rtc.conf b/trunk/conf/rtc.conf
index 608ba3798..5e25933a1 100644
--- a/trunk/conf/rtc.conf
+++ b/trunk/conf/rtc.conf
@@ -1,6 +1,6 @@
 
 listen              1935;
-max_connections     1000;
+max_connections     10;
 srs_log_tank        console;
 srs_log_file        ./objs/srs.log;
 daemon              off;
@@ -27,7 +27,7 @@ rtc_server {
     #
     # The * means retrieving server IP automatically, from all network interfaces,
     # @see https://github.com/ossrs/srs/issues/307#issuecomment-599028124
-    candidate       $CANDIDATE;
+    candidate       *;
 }
 
 vhost __defaultVhost__ {
diff --git a/trunk/src/app/srs_app_rtc_queue.cpp b/trunk/src/app/srs_app_rtc_queue.cpp
index d38cbb117..c963ddce6 100644
--- a/trunk/src/app/srs_app_rtc_queue.cpp
+++ b/trunk/src/app/srs_app_rtc_queue.cpp
@@ -158,10 +158,10 @@ void SrsRtpRingBuffer::notify_drop_seq(uint16_t seq)
 
 SrsNackOption::SrsNackOption()
 {
-    max_count = 10;
-    max_alive_time = 2 * SRS_UTIME_SECONDS;
+    max_count = 15;
+    max_alive_time = 1 * SRS_UTIME_SECONDS;
     first_nack_interval = 10 * SRS_UTIME_MILLISECONDS;
-    nack_interval = 400 * SRS_UTIME_MILLISECONDS;
+    nack_interval = 50 * SRS_UTIME_MILLISECONDS;
     //TODO: FIXME: audio and video using diff nack strategy
     // janus nack option:
     // video: