Just upgraded to Windows 11. I have many devices on LAN including 3 Raspberry Pi's (call them P1, P2, P3) and 3 PC's. On my Notebook(NB) PC - one of the three and just upgraded to Windows 11 - I can get to 2 of the Pi's but not the third. I can get to it from my other 2 PCs. On the NB the missing Pi (P3) doesn't appear in the "arp -a" results. Likewise a ping fails indicating the device is unreachable. My router GUI shows all devices fine. Early on P2 had the same problem - I couldn't see it or access it - but at some point it became available. Can someone tell me what I might do to get network access to P3?