Network Adapter cannot establish connection

Hello. I can't seem to find an answer to this anywhere: I have a database that can be accessed via JDBC from certain IP addresses but not others. The ones that can't access it give me the exeception: "Network Adapter cannot establish connection" The database machine can be PINGed from the client; the IP address of the database is used so it's not a name resolution problem; we are instatiating the driver correctly...AND it WORKS from other clients!
Does anyone have any ideas as to what the problem could be?

If there are firewalls involved, connections on port 1521 have to be allowed.

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