PTIR — Daily Briefing — 2026-09-16
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Executive Summary
GitHub has completed its retirement of SHA-1 from HTTPS on github.com and partner CDNs. Current browsers, Git clients, operating systems, and API libraries should continue working; failures now point to obsolete TLS support rather than a temporary brownout. Separately, Dallas AI is holding an in-person AWS Jam at Dallas College Brookhaven on September 17, offering a timely hands-on cloud-learning opportunity.
Action Queue
Rule out obsolete TLS clients in GitHub workflows
GitHub disabled SHA-1 in HTTPS on September 15 for github.com, GitHub Enterprise Cloud, Data Residency, and partner CDNs. GitHub Enterprise Server is unaffected. The change can affect old browsers, Git clients that push or pull over HTTPS, and software that calls GitHub APIs through outdated TLS libraries.
Recommended action: Make one normal HTTPS clone or pull from each older machine or automation host that still touches GitHub. If it fails during TLS negotiation, update the operating system, Git client, TLS backend, or API runtime rather than weakening certificate settings. Loading github.dev is GitHub’s quick browser test because SHA-1 was already disabled there.
- Urgency: This week; immediate if a workflow is failing
- Importance: ★★★★☆
- Verified active: September 16, 2026
- Deadline: The cutoff took effect September 15, 2026
- Cost: Free verification; remediation cost depends on any unsupported legacy system
- Requirements: A browser, Git client, API client, or automation host that connects to GitHub over HTTPS
- Official completion notice: SHA-1 in HTTPS on GitHub sunset
- Preparation guidance: Sunsetting SHA-1 in HTTPS on GitHub
Prepare for the Dallas AI AWS Jam
Dallas AI’s AWS Jam is scheduled for Thursday, September 17 from 6:30 to 8:30 p.m. Central at Dallas College Brookhaven Campus, 3939 Valley View Lane in Farmers Branch. The event is described as a gamified, hands-on AWS learning experience.
Recommended action: Confirm the RSVP, bring a charged laptop and power adapter, and verify access to the email address used for registration before leaving. Save one brief note after the event: the challenge attempted, the AWS service involved, the mistake that cost the most time, and one classroom or lab use.
- Urgency: This week
- Importance: ★★★★☆
- Verified active: September 16, 2026
- Deadline: Event begins September 17, 2026 at 6:30 p.m. Central
- Cost: The RSVP confirmation lists no fee; no regular price is stated
- Requirements: In-person attendance, event RSVP, laptop, and the organizer’s provided AWS Jam access
- Official event page: AWS Jam Event — Dallas AI
Linux & Self-Hosting
Modern Debian, Fedora, and macOS installations should already negotiate newer HTTPS algorithms. The practical risk is an overlooked old container image, appliance, embedded build host, or long-lived automation runner. Do not “fix” a failed GitHub connection by enabling SHA-1 or disabling certificate verification; update or isolate the client.
PKb Candidates
- Legacy TLS triage: Record the failing host, client version, TLS backend, exact error, last successful date, and upgrade or retirement decision.
- Hands-on event capture: Reduce each workshop to one challenge, one failure mode, one transferable technique, and one possible classroom exercise.