In my case there was an issue derived from having added a new IP address to the LAN interface without deleting the setup 192.168.0.75 address.
Since the routing table still had the route for the original subnet, that created a problem with my specific settings. The environment ZS is in already contains an 192.168.0.0/24 subnet and the ZS routing instruction did not let packets return to the sender.
Dutifully deleting the original 192.168.0.75 address from the LAN interface fixed the problem.