I got it to work. Issue was making the server running in WSL available to the host computer. I was testing the SliderServer in general for its limitations because I have a notebook that does a lot of computation after certain buttons are pressed and caches data. It seems like certain cells won’t run in that case. I’m not sure what the limits are in terms of how elaborate and long running the computations triggered by reactive elements can be. I was wondering though if it is possible to get realtime feedback on things running in the server. I tried using @info in the notebook which works well for updating me when a cell is running. But in the SliderServer that same cell waits until the end of the computation to print anything.