Wowza live Application not able to run

Streaming with OBS STudio -> rtmp://streaming-t.xxx.xxx/live isn working

I was trying to activate WebRTC for lower delays in Application.xml. Even I undo my changes Im not able to get the live Application running anymore.
Server restarting seems fine - Wowza Streaming Engine 4.8.5 - up for about an hour -> but restart live Application does no effect: Application Uptime live not running

Before I try to activate WebRTC I was able to stream to the live application.

In my wowzastreamingengine_error.log I get:
RTPSessionDescriptionDataProviderBasic.getStreamInfo: RTSP/RTP re-streaming timeout
HTTPStreamerAdapterCupertinoStreamer.onPlaylist: Stream not found [mobile/xxxx/playlist.m3u8]: xxxx

Any tips how to go on to get the live application work again?