# CPU usage of Wowza reaches 100% when receiving SRT stream on Windows **URL:** \ **Category:** Wowza Streaming Engine\ **Tags:** srt\ **Created:** [August 26, 2022, 12:48am UTC](https://community.wowza.com/t/cpu-usage-of-wowza-reaches-100-when-receiving-srt-stream-on-windows/95318 "2022-08-26T00:48:20Z")\ **Posts on this page:** 4\ **Page:** 1
**Author:** ![Kenji\_Wakabayashi](https://avatars.discourse-cdn.com/v4/letter/k/ac91a4/32.png) [@Kenji\_Wakabayashi](https://community.wowza.com/u/Kenji_Wakabayashi)\ **Post date:** [August 26, 2022, 12:48am UTC](https://community.wowza.com/t/cpu-usage-of-wowza-reaches-100-when-receiving-srt-stream-on-windows/95318/1 "2022-08-26T00:48:20Z")
OS: Windows Server 2019 Wowza: WowzaStreamingEngine-4.8.19+4-windows-installer.exe * * * CPU usage of Wowza process (java.exe) reaches 100% in a few days when receiving SRT stream on Windows. I believe this is SRT [issue#669](https://github.com/Haivision/srt/issues/669) and could be fixed by updating srt.dll to version 1.4.2 or later with “ENABLE\_STDCXX\_SYNC=ON”. (see: [Steady Clock](https://github.com/maxsharabayko/srt/pull/5)) Actually, this issue could be reproduced quickly by changing the Windows System Clock. Thank you ---
**Author:** ![Rose\_Power-Wowza\_Com](https://sea2.discourse-cdn.com/flex002/user_avatar/community.wowza.com/rose_power-wowza_com/32/431_2.png) [@Rose\_Power-Wowza\_Com](https://community.wowza.com/u/Rose_Power-Wowza_Com)\ **Post date:** [August 26, 2022, 3:36pm UTC](https://community.wowza.com/t/cpu-usage-of-wowza-reaches-100-when-receiving-srt-stream-on-windows/95318/2 "2022-08-26T15:36:12Z")
Thank you, I’ll be sure we have this in our backlog for technical support. ---
**Author:** ![Kenji\_Wakabayashi](https://avatars.discourse-cdn.com/v4/letter/k/ac91a4/32.png) [@Kenji\_Wakabayashi](https://community.wowza.com/u/Kenji_Wakabayashi)\ **Post date:** [February 21, 2023, 6:18am UTC](https://community.wowza.com/t/cpu-usage-of-wowza-reaches-100-when-receiving-srt-stream-on-windows/95318/3 "2023-02-21T06:18:39Z")
I’m trying **Wowza Streaming Engine 4.8.21+6** , but it couldn’t listen any SRT stream from Encoder. (Encoder works as SRT caller) 1. open **Wowza Streaming Engine Manager 4.8.21+6** with chrome (tcp/8088) 2. click the **Applications** tab and select [**live** \> **Stream Files**] 3. click [**+ Add Stream File**] and enter following values then click [**+Add**] - **Enter a name for the new Stream File :** test - **Stream URI :** srt://0.0.0.0:49152 - specifying an actual IP address (Server or Encoder) or [::] instead of 0.0.0.0 in this step will not change the result. 4. back to [**live** \> **Stream Files**] and click [**Connect to this stream**] 5. select as followings and click [**OK**] (displayed **Connection successful test.stream** ) - **Application Instance :** Connect to default application instance: `_definst_` - **MediaCaster Type :** srt 6. move to [**live** \> **Incoming Streams**] and found **test.stream** is listed - but Status of the **test.stream** would not be changed from _ **Waiting for Stream** _ 7. open command prompt as an administrator and run **"netstat -ano -p udp"** - the command does not show the process opening **udp/49152** and of course udpv6 * * * - (ref.) https:// www .wowza.com/docs/ingest-and-publish-an-srt-stream-with-wowza-streaming-engine - [**live** \> **Playback Security** \> **Client Restrictions**] = No client restrictions - in case of **Wowza Stream Engine 4.8.19+4** and **Wowza Streaming Engine 4.8.20+1** , wowza could listen and receive the SRT stream from Encoder in same procedure. - the command **“netstat -ano -p udp”** shows **0.0.0.0:49152** is opened by java.exe process - both 0.0.0.0 and actual server interface address worked - I encountered another problem on **Wowza Stream Engine 4.8.19+4** ; - when I tried “srt://[::]:49152]” for **Stream URI :** above, **Wowza Stream Engine 4.8.19+4** service process would stop working unexpectedly ---
**Author:** ![Jason\_Tuchler](https://sea2.discourse-cdn.com/flex002/user_avatar/community.wowza.com/jason_tuchler/32/462_2.png) [@Jason\_Tuchler](https://community.wowza.com/u/Jason_Tuchler)\ **Post date:** [February 27, 2023, 9:38pm UTC](https://community.wowza.com/t/cpu-usage-of-wowza-reaches-100-when-receiving-srt-stream-on-windows/95318/4 "2023-02-27T21:38:37Z")
@Kenji_Wakabayashi Thank you for you repro steps. This will be best reviewed by our Support Team. Please send the repro steps, along with the below support info for their review: [install-dir]/conf [install-dir]/logs [install-dir]/content (stream file that you’re using) > **[Open a Support Ticket](https://www.wowza.com/support/open-ticket)** > > Open a Wowza suppor ticket so our technical support engineers worldwide can help you succeed with your Wowza software and services.