Hi Donald,
This definitely sounds like either a proxy or a firewall issue. Something must be blocking Maven, but working OK from your web browser.
It's hard to debug these issues without more information, but here's a good hint from StackOverflow:
http://stackoverflow.com/a/16729906/3750035
So, I'd recommend looking again at your Maven proxy settings...or checking to see if you have a firewall that may be blocking this access. If you need further help, you can always send more info about your proxy settings along to this mailing list.
Good luck,
Tim
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-- Tim Donohue Technical Lead for DSpace & DSpaceDirect DuraSpace.org | DSpace.org | DSpaceDirect.org