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Microsoft site throwing warnings after someone forgot to renew cert

ID: 79b619e2-b4f5-5e87-bd43-4b07e6d92969

STIX ID: report--79b619e2-b4f5-5e87-bd43-4b07e6d92969

Feed Name: The Register (Security)

Date Published: 2026-06-15

Date Updated: 2026-07-23

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Microsoft failed to renew the SSL/TLS certificate for connectivity.office.com, a domain used by IT professionals to test Microsoft 365 connectivity, causing browser trust warnings. The issue is an operational certificate-management lapse with limited user impact but underscores the need to improve renewal processes ahead of upcoming shorter certificate lifespans.

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