[Tutor] Pip install and Ipv6

Mats Wichmann mats at wichmann.us
Fri Jul 6 11:09:01 EDT 2018

On 07/02/2018 10:48 AM, Luiz Gustavo S. Costa wrote:
> Hello,
> Is anyone else here having problems using Pip repository with ipv6?
> If I try to install something with pip, I get this:
> (python2) lgcosta:api/ $ pip install falcon
> Collecting falcon Retrying (Retry(total=4, connect=None, read=None,
> redirect=None, status=None)) after connection broken by
> 'ProtocolError('Connection aborted.', error(104, 'Connection reset by
> peer'))': /simple/falcon/
> and it does not work ... but, I discovered this:
> (python2) lgcosta:api/ $ curl -I https://pypi.python.org/
> curl: (35) gnutls_handshake() failed: Error in the pull function.
> (python2) lgcosta:api/ $ host pypi.python.org
> pypi.python.org is an alias for dualstack.python.map.fastly.net.
> dualstack.python.map.fastly.net has address
> dualstack.python.map.fastly.net has IPv6 address 2a04:4e42:4::223
> My default output is ipv6, so if I force it out by ipv4, it works:
> (python2) lgcosta:api/ $ curl -I -4 https://pypi.python.org/
> HTTP/1.1 301 Redirect to Primary Domain
> Server: Varnish Retry-After: 0
> Location: https://pypi.org/
> Content-Type: text/html; charset=UTF-8
> Content-Length: 122
> ....
> output over ipv6, the repository does not work, only for ipv4.
> I did not find the option to force ipv4 on the pip.
> Does anyone have any notice or similar reports?

Given the lack of responses, probably you should try poking around the
issue tracker for pip:


or some of the other resources listed on the main page there (click the
Code tab from the Issue page to see)

Best of luck!

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