You haven't provided any configuration information, so here are two guesses. If they aren't applicable, try posting network configuration info. If you want to diagnose the problem, use tcpdump(1).
This "Sounds" like one of two things:
1) Route table mismanagement -- e.g. a missing default route, or bad subnet masking. See ifconfig(8) and route(8). If you use DHCP for configuration, and you see routing or other information is not configured properly see dhclient.conf(5).
2) Firewall settings. If you're using PF or ipfw, of course. Specific guidance will depend on which is implemented, and what is being blocked exactly.
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