Re: file_get_contents(http://www.whois.com/whois/xxxxxxxxxxxx.com): failed to open stream

in plugins/SEO/RankChecker.php

replace the line ~ 60 with:
return str_replace(' ', ' ', Http::sendHttpRequest($url, $timeout = 20, @$_SERVER['HTTP_USER_AGENT']));
(change timeout to 20)

-> does it fix it?