PyPI Blog: Incident File Hosting Errors
The Python Package Index (PyPI) experienced intermittent download errors in August 2026 due to a misconfiguration in a Fastly CDN cache node. The issue was resolved after user reports helped identify the root cause, restoring full functionality to the repository.
Why it matters
PyPI is a critical piece of infrastructure for the global software development community; downtime directly impacts millions of developers and automated systems.
For about two weeks in August 2026, some PyPI users hit intermittent 502 and 503 errors downloading files from files.pythonhosted.org , triggering failures during installation from PyPI. Thanks to our users filing reports in the support tracker ; one report in particular narrowed the problem to a single cache node.
Two separate problems were uncovered. A canary deployment inside Fastly's network had triggered a misconfiguration at one cache node, causing Fastly's routing layer to return 502 responses for traffic reaching the affected cache node. Separately, I found and fixed several bugs in our own Fastly configuration around origin fallback and range request behavior. Those had been there for a while, and only surfaced while digging into these reports.
Both intermittent problems are now fixed, and downloads are back to full function since August 28.
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