I'm not familiar with Cisco's PIX, but if you suspect pf is blocking some connections then make sure you have log keyword in either block or pass rules and run tcpdump(8) on pflog(4) interface or check its log file in /var/log/pflog. More about that in: http://www.openbsd.org/faq/pf/logging.html
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The best way to learn UNIX is to play with it, and the harder you play, the more you learn.
If you play hard enough, you'll break something for sure, and having to fix a badly broken system is arguably the fastest way of all to learn. -Michael Lucas, AbsoluteBSD
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