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certificate expiration

5 articles · Page 1 of 1
Ops Community
Ops Community
Apr 28, 2026 · Operations

How Dangerous Is an HTTPS Certificate Expiration and How Ops Can Prevent It?

When an HTTPS certificate expires, browsers show warnings, users abandon sites, services become unavailable, and security is weakened, so this article explains the TLS fundamentals, the risks of expiration, real‑world outage cases, and provides step‑by‑step guidance on acquisition, deployment, automated renewal, monitoring, and best‑practice procedures for reliable certificate management.

AutomationHTTPSOperations
0 likes · 25 min read
How Dangerous Is an HTTPS Certificate Expiration and How Ops Can Prevent It?
Java Tech Enthusiast
Java Tech Enthusiast
Jun 26, 2025 · Information Security

Why Microsoft Office Users Saw TLS Certificate Errors and What It Means

A missed renewal of a TLS certificate for the domain https://support.content.office.net caused widespread certificate‑expired warnings for Office users on June 24, 2024, affecting all services that rely on several related domains and will likely be resolved once Microsoft updates the certificate during regular working hours.

Microsoft OfficeOperationscertificate expiration
0 likes · 3 min read
Why Microsoft Office Users Saw TLS Certificate Errors and What It Means
Efficient Ops
Efficient Ops
Nov 26, 2023 · Operations

Top Open‑Source Tools to Monitor HTTPS Certificate Expiration

This article reviews why HTTPS certificate expiration checks are often missed and introduces several open‑source monitoring tools—including blackbox_exporter, EaseProbe, uptime‑kuma, domain‑admin, and a simple shell script—to help operations teams ensure timely certificate renewal.

HTTPSPrometheuscertificate expiration
0 likes · 5 min read
Top Open‑Source Tools to Monitor HTTPS Certificate Expiration
Efficient Ops
Efficient Ops
Mar 21, 2020 · Information Security

Why Did Apple Devices Show Certificate Errors on March 20, 2020?

In March 2020, Apple devices displayed security warnings because the HTTPS certificate for appleimap.163.com had expired due to NetEase Mail’s failure to renew it, highlighting how overlooked certificate management can disrupt services and underscoring the need for automated monitoring tools in large organizations.

AppleCertificateNetEase
0 likes · 4 min read
Why Did Apple Devices Show Certificate Errors on March 20, 2020?