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I'm also getting this error but it always happens and I can't connect to the DB. This is from a remote machine, running it on the server gives no errors.
Disabling the firewall and/or adding the port 1521 to the exception list hasn't helped.
This worked for me:
Open the "New/Select Database Connection" dialogue and try changing the connection type setting from "Basic" to "TNS" and then selecting the network alias (for me: "ORCL").