Cannot open port 8080 on Amazon EC2

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http://serverfault.com – I am having difficulty getting my Varnish/Nginx Wordpress setup working. I had set up varnish to listen on poert 80, and nginx to listen on port 8080, with a rule on wp-admin URLs to pass through to nginx (bypassing the cache). The main blog pages seem to work ok with this setup, but the dashboard and other admin pages are not reachable, which suggests that the varnish configuration is "working" (in that it is behaves differently for the pages with the rule set up). The site itself works fine if I disable Varnish and just set nginx to listen on port 80. I did wonder if there was a problem with (HowTos)