My Raspberry Pi 3 b+ will not allow me to ping it even though I've ping'd and ssh'd into it plenty of times before now.
I can ping my main computer from the pi but not the other direction.
ping hostname.local ping: cannot resolve Hostname.local: Unknown host
If I use
ifconfig on my Pi and get the IP address manually, then I can ping it.
ping pi_ip_address.local PING Hostname.local (pi_ip_address): 56 data bytes