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Why cant I sign into secure web pages such as yahoo mail?

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I have an error message s.yimg.com : potentially vulnerable to CVE-2009-3555

I have an error message s.yimg.com : potentially vulnerable to CVE-2009-3555

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The message about CVE-2009-3555 is meant for webmasters to make them aware that they need to fix their servers.
Firefox 3.6 versions can detect such a misconfiguration and displays a warning in the "Tools > Error Console".

See http://wiki.mozilla.org/Security:Renegotiation