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SID, port and host are a function of the way the datbase you are trying to access has been set up. If you've installed the database you ought to have supplied the SID during set-up.
The host is simply the domain or IP address of the machine on which the dabase is installed. If it's the same one you're running on, just use "localhost".
1521 is the default port, unless you've specified something else when setting up the database that's the port you'll want.