# PyPI Partial Outage

- Provider: [PyPI](https://down.guide/pypi)
- Level: confirmed
- Impact: Partial outage
- lasted 2d 13h
- started 2025-05-24 23:37 UTC
- pypi.org - Backends
- id: DWN-7f730c5cf4
- Official page: https://stspg.io/dcxkgkkx6sj8

## Updates from PyPI
### 2025-05-24 22:57 UTC: investigating
We are working to investigate a partial outage in the PyPI backends.

### 2025-05-24 23:11 UTC: identified
We have identified a large increase in CDN cache misses causing excess load on our backends. We are working to determine the reason for this increase.

### 2025-05-24 23:37 UTC: identified
We have identified a flood of requests from a cluster using the python-requests/2.32.3 User-Agent, and attempting to hit all JSON project/releasese en masse.
This causes excessive cache misses, which are overwhelming our backends. A temporary block has been put in place.

### 2025-05-24 23:54 UTC: monitoring
Our block is in place and systems are stable, but we are not satisfied with having to block such a generic user-agent. If you are aware of a system that began a mass crawl of PyPI's JSON release endpoints starting at around 22:05 UTC 2025-05-25, please contact admin@pypi.org.

### 2025-05-25 12:16 UTC: monitoring
We have removed the temporary block and are continuing to monitor.

### 2025-05-27 12:53 UTC: resolved
We have not seen a return of the traffic that caused this incident after removing the temporary block. We will open a new incident if we need to take action again.

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