Microsoft neglected to renew the certificate for one of its critical web pages, forcing the site to go down and redirecting visitors elsewhere.
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Those who attempted to access the site at that period received the standard “Your connection is not private” message, and browsers such as Chrome, Firefox, and Safari cautioned users not to proceed.
The credential for the Windows Insider software testing program expired on Thursday, June 9, in the afternoon hours.
Certificates expire and are not renewed on time every now and again, causing a few problems in the process. In October 2021, one of the largest non-profit Certificate Authorities (CA) services saw a surge in renewals from websites and apps, resulting in some big name sites experiencing significant outages.
A month later, an expired certificate affected Windows 11 21H2 and prevented Windows users from opening certain apps.
Due to its cross-signed DST Root CA X3 expiring, Let’s Encrypt’s issue, which is run by the Internet Security Research Group, left websites and apps such as Shopify and Slack experiencing outages. At the time, Let’s Encrypt took to Twitter to advise the affected customers to consult the community forum, offering no promise of resolving the issue quickly.
Back in 2020, an expired authentication certificate made Microsoft Teams inaccessible for a while.
While expired certifications are a nuisance, they can be even worse if they affect root certificates and bork services, the publication explains. Such was the case with Sectigo’s AddTrust legacy root certificate which, when it expired two years ago, affected thousands of customers.
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