Ganglia web generating "error collecting ganglia data (:): fsockopen error"

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http://serverfault.com – Now, I'm trying to install a new ganglia-web interface to replace an older one. Google searching on the error got me a lot, but none of it helps. One large distinction I note is that Google usually returns "There was an error collecting ganglia data ( fsockopen error:" where my error does not include an IP address or port number. The only substantive result that matches my error says I should check conf.php, but that file isn't anywhere obvious. What am I missing? (HowTos)