Hi -
I fixed the problem.
NOTE TO SELF:
If it looks like a firewall, and it quacks like a firewall ... then it's probably going to wind up being a firewall!
My anti-virus software (Pc-Cillen, from Trend Micro: highly recommended, BTW! Better than both McAfee and Norton put together, IMHO...) installed itself with it's own firewall; it was blocking both "ping" and X-windows.
SOLUTION:
Quote:
1. Went into Pc-Cillen Control Panel, [Network Security], [Personal Firewall],
2. Selected the default profile and clicked [Edit]
3. Clicked on the [Exception List] tab and clicked [Add]
4. Added firewall exceptions for:
a) Name= ping,
Target= all applications,
Connection= Incoming,
Action= ALLOW,
Protocol= ICMP,
IP Setting= Subnet Mask
b) Name= X-windows,
Target= c:\cygwin\usr\X11R6\bin\Xwin.exe,
Connection= incoming,
Action= ALLOW,
Protocol= TCP,
IP Setting= Subnet Mask
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A couple of subtle (at least to me ;-)) points:
a) The Pc-Cillen firewall was an integral part of the Pc-Cillen system protection - it didn't want me to disable it (and, frankly, I didn't *want* to disable it. Despite the fact that it's not my primary firewall.)
b) When I made the new rules, I needed to allow *INCOMING* connections (the default in the GUI was to allow "outgoing" - not what I needed!)
c) I made the IP setting by "subnet mask" (the GUI default was "all IP addresses"). Since my network is 192.168.1.xxx/255.255.255.0, this let's me ping and use X windows freely in my network ... while still giving my full firewall protection from anything in the outside world.