:The [http://osuosl.org/ OSUOSL], which hosts Gitorious, has an aggressive IP blacklist policy. If you once were able to push but now cannot, send an email to support@osuosl.org requesting that your IP be removed from the blacklist.
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:Please contact to [https://github.com/contact github support], or look at [https://help.github.com/ GitHub FAQ]
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To check if the problem is with your key, try:
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ssh -v git@github.com
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A successful ssh setup results in a normal response "Hi! You've successfully authenticated, but GitHub does not provide shell access."