ContributionsMost RecentMost LikesSolutionsRe: "A required certificate is not within its validity period" - eight or more users can't connect Same thing, all from Windows 7 PC's though which I know are not supported by Windows. I've tried re-installing theMicrosoftRootCertificateAuthority2011.cerwhich was the fix for when you get this error installing .Net framework. Tried all 3 browsers, it seems the goto connector just doesn't talk to the servers anymore, or trust them. UK.