Introduction

files.pythonhosted.org timeout means pip can reach PyPI metadata or start a download, but the package file fetch path is timing out before completion. This often comes from outbound network restrictions, TLS interception, proxy misconfiguration, or an environment that should be using a closer package mirror instead of the default public host.

Symptoms

  • pip install hangs or times out while downloading wheel or source files
  • Metadata requests succeed, but file download URLs fail
  • The issue is worse in CI, Docker builds, or locked-down corporate networks
  • Other HTTPS endpoints may work while files.pythonhosted.org does not

Common Causes

  • DNS or routing to files.pythonhosted.org is unstable from the current network
  • A proxy or TLS inspection layer breaks large package downloads
  • The environment needs an internal mirror but still points at public PyPI
  • Default pip timeout values are too short for the current network path

Step-by-Step Fix

  1. 1.Test DNS and HTTPS reachability directly
  2. 2.Confirm the host resolves and the TLS path works outside pip first.
bash
nslookup files.pythonhosted.org
curl -I https://files.pythonhosted.org/
  1. 1.Inspect pip config and proxy settings
  2. 2.Check whether pip is using the expected index, proxy, and timeout values.
bash
pip config list
env | grep -i proxy
  1. 1.Try a higher timeout or a mirror
  2. 2.If the path is simply slow, increase timeout. If the path is structurally bad, use the correct mirror.
bash
pip install --timeout 60 <package-name>
  1. 1.Retest in the exact failing environment
  2. 2.CI runners, containers, and developer laptops often have different egress paths.

Prevention

  • Standardize pip mirror and timeout settings per environment
  • Validate both index metadata and file-download paths in CI bootstrap checks
  • Document proxy and TLS interception expectations for Python builds
  • Prefer close mirrors for large dependency installation workflows