FTBFS on vivid: attempts to download pies from external network

This package currently FTBFS on Ubuntu Vivid. See [1] for full log, relevant part:
I: pybuild base:170: python3.4 setup.py test
running test
Searching for pies>=2.6.0
Reading https://pypi.python.org/simple/pies/
Download error on https://pypi.python.org/simple/pies/: [Errno 111] Connection refused -- Some packages may not be found!
Couldn't find index page for 'pies' (maybe misspelled?)
Scanning index of all packages (this may take a while)
Reading https://pypi.python.org/simple/
Download error on https://pypi.python.org/simple/: [Errno 111] Connection refused -- Some packages may not be found!
No local packages or download links found for pies>=2.6.0
error: Could not find suitable distribution for Requirement.parse('pies>=2.6.0')
E: pybuild pybuild:256: test: plugin distutils failed with: exit code=1: python3.4 setup.py test
dh_auto_test: pybuild --test -i python{version} -p 3.4 --dir . returned exit code 13
debian/rules:5: recipe for target 'build' failed
make: *** [build] Error 13
dpkg-buildpackage: error: debian/rules build gave error exit status 2

I was able to reproduce this in a Vivid pbuilder, but curiously enough not in a sid pbuilder [2]. So for whatever reason it seems to be working on Debian, but not Ubuntu.

[1] https://launchpadlibrarian.net/193716542/buildlog_ubuntu-vivid-amd64.isort_3.9.2%2Bds1-1_FAILEDTOBUILD.txt.gz
[2] Note that the Vivid pbuilder environment was running on Vivid, while the sid pbuilder environment was running on sid, so potentially affected by any differences in the stack.