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Firewall rules: not as secure as you think
Firewall rules: not as secure as you think This post introduces some tricks for jailbreaking hosts behind “s...
… and now connections to https://external.example.com are encrypted and handled by stunnel, which will decrypt the traffic and route those requests to squid running on port 3128 of the same machine. Conclusion I don’t think all firewall rules are ineffective or bad, but if the same person or organization controls both ends of a connection then typically anything short of completely disabling internet access can be jailbroken in some way with off-the-shelf open source tools. It does require some work, but as you can see with the associated holepunch repository even moderately sophisticated firewall escape hatches can be neatly packaged for others to reuse.
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