This is just because the certificate used for some of the older forum results is no longer valid. You can safely ignore that warning. Not sure why it only apply to older pages, I guess they're hosted slightly differently, or that Google is relying on an old index?
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This is just because the certificate used for some of the older forum results is no longer valid. You can safely ignore that warning. Not sure why it only apply to older pages, I guess they're hosted slightly differently, or that Google is relying on an old index?