How can I troubleshoot pip installations behind a proxy using CNTLM?

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Release: 2024-11-03 19:04:29
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How can I troubleshoot pip installations behind a proxy using CNTLM?

Troubleshooting Proxy-Based pip Installations with CNTLM

When implementing pip behind a proxy using CNTLM, users may encounter difficulties ensuring its proper configuration. To verify its functionality, consider the following steps:

Run the command:

cntlm.exe -c cntlm.ini -I -M http://google.com
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If this command fails with a "Connection to proxy failed" error, it indicates an issue with your CNTLM setup.

Furthermore, using the command:

pip install --proxy=user:pass@localhost:3128
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where "user" and "pass" are your proxy credentials, may result in an error fetching the index base URL.

Alternative Solution

If CNTLM proves problematic, you can alternatively set the https_proxy environment variable to point to your proxy server. Note that this variable is different from http_proxy. Execute the command:

export https_proxy=http://web-proxy.mydomain.com
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This will route all HTTPS requests, including those made by pip, through your proxy server.

Finally, run the following command to install a package using pip:

sudo -E pip install somepackage
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This command ensures that the https_proxy environment variable is inherited during the installation process.

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