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Messages in error console - potentially vulnerable to CVE-2009-3555

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Shown in Error Console on every site visited - potentially vulnerable to CVE-2009-3555

What is this and what can I do about it?

URL of affected sites

http://

Shown in Error Console on every site visited - potentially vulnerable to CVE-2009-3555 What is this and what can I do about it? == URL of affected sites == http://

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That message 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 also https://wiki.mozilla.org/Security:Renegotiation