See above video for the Octane/Blender V4 Server crash while rendering with Denoise in the Viewport, also occurs during rendering of animations with Denoise on. Go to the end of the video for the actual server crash/error, seems to have been triggered while another instance of Octane/Blender was open but not fully sure. Once the server is closed out and restarted Octane/Blender V4 is functional again.
Os Win 10
3x GTX 980 onboard, 3x GTX networked
Nvidia Driver 417.01
Octane v4/Blender 16.3