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LinkedIn certificate blunder leaves users LockedOut!

Many LinkedIn users were unable to access the professional networking website today after its administrators failed to renew a TLS certificate before it expired.

The certificate in question was used by various country-specific LinkedIn websites such as and It expired at midday today, immediately preventing users from accessing the site via these hostnames.

The expired certificate was issued to, but was also valid for – and used by – dozens of other country-specific LinkedIn hostnames. The main site at was not affected.

The sites were still inaccessible a few hours after the problem manifested itself.

Ironically, LinkedIn's better-than-average security made the expired certificate even more problematic. Most browsers will allow users to ignore certificate validation warnings — however unwise that may be — but the warnings cannot be ignored on these LinkedIn sites.

LinkedIn is in a minority of...(continued)

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