2013 HELP: DNS not resolving host name. Mac problem, rare. Possible fixes

DNS not resolving host name
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Problem on Macs. Rare: On login, message:
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Login failed.

DNS could not resolve the host name.

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Known problem. If you can connect to the www.secondlife.com web site, the items below probably apply to your situation.
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Jira Entry:  
https://jira.secondlife.com/browse/VWR-25627?
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Here is a reported fix: 
http://neilrobinson.wordpress.com/2008/05/19/a-fix-for-dns-errors/

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