There could be various reasons for this, but here are some common solutions:
IP, Port, and Password configuration in both OBS and Streamer.bot127.0.0.1 as the IP, otherwise make sure you are using the correct LAN IP address (e.g. 192.168.1.x)0.0.0.04455 is already occupied, you can try changing it to something else like 4456 or 1234obs-websocket version. If you aren't sure, you should select v5.x on the connection configuration in Streamer.bot