From: <forums_at_java.net>
Date: Mon, 25 Mar 2013 17:40:29 -0500 (CDT)

The error you are seeing is usually caused by either an HTTP proxy issue, or
a network bandwidth/latency issue. I've written up a quick blog that gives
some tips that may help:
https://blogs.oracle.com/dipol/entry/troubleshooting_glassfish_update_center
[1]

[1]
https://blogs.oracle.com/dipol/entry/troubleshooting_glassfish_update_center

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