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I have a PC running Windows 10 and a Mac running macOS 10.12.4 both connected to a common home WiFi network.

Mac network settings
Firewall: disabled, IP: 192.168.1.18, Subnet: 255.255.255.0

Windows network settings
Firewall: disabled, IP: 192.168.1.14, Subnet: 255.255.255.0

Ping Results

  • Mac->Mac (other) = success
  • Mac->PC = success
  • PC->PC = success
  • PC->Mac = fail

When monitoring tcpdump via Terminal on the Mac it is showing that the computer is receiving the ping, but the PC is not receiving a reply.

  • Then - after entering sudo tcpdump -nni en0 icmp (or en1/2/3) in the Mac's Terminal - open a second Mac Terminal window and enter ping -c 3 192.168.1.14. To stop tcpdump'ing simply enter ctrl-C! – klanomath Apr 23 '17 at 2:12
  • @klanomath The ping to the PC in the new terminal window is successful and the original terminal window shows an ICMP echo reply in the log – Michael Voccola Apr 23 '17 at 2:15
  • I would reboot the router/access point then. – klanomath Apr 23 '17 at 2:17
  • @klanomath reset all AP and router - still no response when pinging the Mac from the PC – Michael Voccola Apr 23 '17 at 2:20
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I had similar problems, tried lots of things and finally tried not only to shutdonw my checkpoint VPN client but also delete all profiles and one would'nt delete as it had some firewall settings enforced...sounded scary so I removed checkpoint completely and viola ping works :) https://community.checkpoint.com/thread/6627-i-have-endpoint-installed-on-my-system-and-want-to-uninstall-it-because-a-virus-has-masked-it-from-view-i-cant-find-it-on-the-launch-pad-or-in-the-applications-library-how-can-i-locate-it-to-uninstall-on-my-mac

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