# RTSP streaming got "udp port unreachable" **URL:** \ **Category:** Wowza Streaming Engine\ **Created:** [March 16, 2015, 9:46am UTC](https://community.wowza.com/t/rtsp-streaming-got-udp-port-unreachable/44630 "2015-03-16T09:46:10Z")\ **Posts on this page:** 2\ **Page:** 1
**Author:** ![Quang\_Huy\_Tran](https://avatars.discourse-cdn.com/v4/letter/q/ac91a4/32.png) [@Quang\_Huy\_Tran](https://community.wowza.com/u/Quang_Huy_Tran)\ **Post date:** [March 16, 2015, 9:46am UTC](https://community.wowza.com/t/rtsp-streaming-got-udp-port-unreachable/44630/1 "2015-03-16T09:46:10Z")
Hi, I’m currently doing a live application with RTSP streaming, i notice that RTSP only works when rtp over tcp. With rtp over udp, i got that message when i use tcpdump: “ICMP x.x.x.x udp port 6974 unreachable”. As i know “udp port unreachable” means the host does not listen on that port. Then i try netstat to find which port wowza is listenning, i cannot see any udp port, but i see this line in log file “RTPUDPTransport.bind[live/_definst_]: in:0.0.0.0/0.0.0.0:6974”. So did i do something wrong? Thanks, Huy. ---
**Author:** ![Quang\_Huy\_Tran](https://avatars.discourse-cdn.com/v4/letter/q/ac91a4/32.png) [@Quang\_Huy\_Tran](https://community.wowza.com/u/Quang_Huy_Tran)\ **Post date:** [March 25, 2015, 6:15pm UTC](https://community.wowza.com/t/rtsp-streaming-got-udp-port-unreachable/44630/2 "2015-03-25T18:15:46Z")
Hi, I think that it’s belongs to my load balancer problem, in my real server i have a VIP and real IP, I see that when wowza server sends udp data to client, it uses real IP, but client send RTCP status to VIP, can it be the cause of my problem? And i do not know why wowza use real IP instead of VIP, because in this server i also deployed a Darwin Streaming server, it worked well with my load balancer and use VIP when sending udp data to client. Any help would be appreciated, thanks! Huy.