Hi guys, I have joined Bleeping Computer because I really do believe the PC support on here is the very best on the Internet.
I have 2 Vista PCs both with networked shared drives. The network is Private.
Three weeks ago I found I could no longer ping from Computer1 to Computer2 and yet the other way works fine. I also have 2 laptops that can no longer ping to Computer2.
I have no idea what has changed on Computer2.
After weeks of research, comparing Windows settings between PCs, resetting the router, checking ZoneAlarm, services that should be running, resetting winsock, running SFC, etc, etc I have found that even if both PCs are started in Safe Mode With Networking I still cannot ping to Computer2 from Computer1. The other way is ok still.
I switched on Windows Firewall on Computer2 and can see in the log that ICMP Echo requests are being dropped (not blocked as I expected):-
2014-01-24 16:18:36 DROP ICMP 192.168.1.66 192.168.1.72 - - 60 - - - - 8 0 – RECEIVE
192.168.1.66 is Computer1 and 192.168.1.72 is Computer2.
Changing various Windows Firewall settings including adding Inbound and Outbound Rules for ICMP has made no difference.
I am convinced that the problem is with missing/wrong ICMP registry keys or permissions. I have now run out of ideas and would desperately appreciate any help.