HTTP-01 validation times out on cloud-hosted IIS sites
HTTP-01 secondary validation times out on a cloud-hosted IIS site, so challenge requests from most validation centers never arrive.
Tier II · Emerging Problems that are still building up.
6 public reports · first reported 17 September 2026 · last reported 20 September 2026
What's going wrong
Website owners running Microsoft IIS on cloud servers report that Let's Encrypt HTTP-01 domain checks time out.
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 6 reports are about, and how many came each month.
- Related problems.
No business has been found with this problem yet, so the report has no contacts. All sales are final — no refunds. Pricing.