Cygwin and firewalls
Andrew Schulman
andrex@alumni.utexas.net
Sun Jun 19 13:52:00 GMT 2005
>> Why is this a Cygwin question? A firewall is a firewall. Network
>> applications, both Cygwin and non-Cygwin, have to deal with it. I don't
>> know what a Cygwin-hostile firewall would look like.
>
> Cygwin uses sockets to implement many of its functions, such as IPC.
> Some overzealous firewalls install themselves deeply into the winsock
> stack (I believe it's called 'layered service provider' API) and install
> hooks throughout. This can cause things to break if the firewall
> implementation is not done properly and without bugs, or causes the
> semantics of socket operations to change. See for example, the threads
> about crappy VPN clients causing cygwin programs to hang, or the
> Zonealarm firewall causing the X11 server to hang at startup. Sadly the
> archives are littered with examples of poorly written firewall-type
> software that causes things to break, so it's not such a stupid
> question.
OK, thanks. Learn something new every day.
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