I’m afraid I don’t have ay experience with Rasp Pi’s to be able to suggest much. The connection refused message could be coming from the Bokeh server, or I guess it could be coming from a Rasp Pi firewall or something? The only way I know to to know is to examine the Bokeh server logs. If the Bokeh server is rejecting the connection, it will say why. If nothing is there, then the rejection is happening before the connection even gets to the Bokeh server.