HTTP-01 challenges reset by home network firewalls
HTTP-01 validation is reset by a home server's network after the TCP handshake, so the challenge never reaches the web server.
Tier II · Emerging Problems that are still building up.
7 public reports · first reported 4 September 2026 · last reported 5 September 2026
What's going wrong
People validating certificates with Let's Encrypt over the HTTP-01 method report that the connection is reset after the TCP handshake, so the challenge request never reaches their web server even though the domain looks publicly reachable.
AI-assisted: written with the help of AI from the reports. The idea report has the full summary.
In the idea report
- The full summary.
- The products the 7 reports are about, and how many came each month.
- Related problems.
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