can't install with pip3

[r-valle]

I am trying to install this package using the following command:
pip3 install django-modeladmin-reorder. I have encountered the following error:
Collecting django-modeladmin-reorder
Retrying (Retry(total=4, connect=None, read=None, redirect=None, status=None)) after connection broken by 'NewConnectionError('<pip._vendor.urllib3.connection.VerifiedHTTPSConnection object at 0x7fc8ba0365f8>
: Failed to establish a new connection: [Errno -3] Temporary failure in name resolution',)': /simple/django-modeladmin-reorder/
(this message appears several times)
Stack: Python 3.5.2 Django 1.11.17