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Firewalls (February 1996) |
> Depends on how the firewall is set up. A firewall worth its salt these > days will have both dynamic (state driven ) packet filtering and proxies. > The proxy could try to establish another TCP connection, but this > connection would have to be permitted by the packet filtering. And what about a proxy that's *expected* to open TCP connections, for example an SMTP proxy? No, he couldn't attach to port 23, but odds are there's opportunities on port 25 somewhere. Follow-Ups:
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