diff --git a/trunk/src/app/srs_app_rtc_conn.cpp b/trunk/src/app/srs_app_rtc_conn.cpp
index b26dfa16a2b..ba3f0f397d0 100644
--- a/trunk/src/app/srs_app_rtc_conn.cpp
+++ b/trunk/src/app/srs_app_rtc_conn.cpp
@@ -1896,6 +1896,7 @@ srs_error_t SrsRtcConnection::add_publisher(SrsRtcUserConfig* ruc, SrsSdp& local
 
     // TODO: FIXME: Change to api of stream desc.
     if ((err = negotiate_publish_capability(ruc, stream_desc)) != srs_success) {
+        srs_error("publish negotiate offer=%s", srs_string_replace(ruc->remote_sdp_str_.c_str(), "\r\n", "\\r\\n").c_str());
         return srs_error_wrap(err, "publish negotiate, offer=%s", ruc->remote_sdp_str_.c_str());
     }
 
@@ -1935,6 +1936,7 @@ srs_error_t SrsRtcConnection::add_player(SrsRtcUserConfig* ruc, SrsSdp& local_sd
 
     std::map<uint32_t, SrsRtcTrackDescription*> play_sub_relations;
     if ((err = negotiate_play_capability(ruc, play_sub_relations)) != srs_success) {
+        srs_error("play negotiate offer=%s", srs_string_replace(ruc->remote_sdp_str_.c_str(), "\r\n", "\\r\\n").c_str());
         return srs_error_wrap(err, "play negotiate, offer=%s", ruc->remote_sdp_str_.c_str());
     }