My workplace uses Cisco AnyConnect VPN (but I have seen same problems with other VPNs as well, eg. here) and it seems to break AirDrop, Sidecar and similar Apple's local network services.
While I am connected to VPN on my macbook, I cannot AirDrop files to my macbook, and Sidecar doesn't start (shows a timeout error after a while). When I disconnect, everything works again.
Is there a know set of things (ports, port ranges, network broadcasts?) I could change or enable in VPN settings so that the 'Apple stuff' would still be routed to a local network at home? It seems that now everything gets routed into work VPN.
Thanks! I googled, but so far found only threads asking for help, with no solution.