Maybe, I can clarify a bit as I encounter a similar problem. There is no error message, but I see a lot of traffic to pypi.org (This traffic is unwanted)
I masked pypi.org in my hosts file and wanted to force the use of my devpi server, but then, pipenv install fails.
Current constraints:
ipykernel
Finding the best candidates:
INFO:pip9._vendor.requests.packages.urllib3.connectionpool:Starting new HTTP connection (1): 10.56.0.120
INFO:pip9._vendor.requests.packages.urllib3.connectionpool:Starting new HTTPS connection (1): wiki.pm1a.com
INFO:pip9._vendor.requests.packages.urllib3.connectionpool:Starting new HTTPS connection (1): pypi.org
WARNING:pip9._vendor.requests.packages.urllib3.connectionpool:Retrying (Retry(total=4, connect=None, read=None, redirect=None)) after connection broken by 'NewConnectionError('<pip9._vendor.requests.packages.urllib3.connection.VerifiedHTTPSConnection object at 0x000002D74F344518>: Failed to establish a new connection: [WinError 10061] Es konnte keine Verbindung hergestellt werden, da der Zielcomputer die Verbindung verweigerte',)': /simple/ipykernel/
INFO:pip9._vendor.requests.packages.urllib3.connectionpool:Starting new HTTPS connection (2): pypi.org
WARNING:pip9._vendor.requests.packages.urllib3.connectionpool:Retrying (Retry(total=3, connect=None, read=None, redirect=None)) after connection broken by 'NewConnectionError('<pip9._vendor.requests.packages.urllib3.connection.VerifiedHTTPSConnection object at 0x000002D74F344B00>: Failed to establish a new connection: [WinError 10061] Es konnte keine Verbindung hergestellt werden, da der Zielcomputer die Verbindung verweigerte',)': /simple/ipykernel/
INFO:pip9._vendor.requests.packages.urllib3.connectionpool:Starting new HTTPS connection (3): pypi.org
WARNING:pip9._vendor.requests.packages.urllib3.connectionpool:Retrying (Retry(total=2, connect=None, read=None, redirect=None)) after connection broken by 'NewConnectionError('<pip9._vendor.requests.packages.urllib3.connection.VerifiedHTTPSConnection object at 0x000002D74F33EB70>: Failed to establish a new connection: [WinError 10061] Es konnte keine Verbindung hergestellt werden, da der Zielcomputer die Verbindung verweigerte',)': /simple/ipykernel/
INFO:pip9._vendor.requests.packages.urllib3.connectionpool:Starting new HTTPS connection (4): pypi.org
WARNING:pip9._vendor.requests.packages.urllib3.connectionpool:Retrying (Retry(total=1, connect=None, read=None, redirect=None)) after connection broken by 'NewConnectionError('<pip9._vendor.requests.packages.urllib3.connection.VerifiedHTTPSConnection object at 0x000002D74F33E438>: Failed to establish a new connection: [WinError 10061] Es konnte keine Verbindung hergestellt werden, da der Zielcomputer die Verbindung verweigerte',)': /simple/ipykernel/
INFO:pip9._vendor.requests.packages.urllib3.connectionpool:Starting new HTTPS connection (5): pypi.org
WARNING:pip9._vendor.requests.packages.urllib3.connectionpool:Retrying (Retry(total=0, connect=None, read=None, redirect=None)) after connection broken by 'NewConnectionError('<pip9._vendor.requests.packages.urllib3.connection.VerifiedHTTPSConnection object at 0x000002D74F33E208>: Failed to establish a new connection: [WinError 10061] Es konnte keine Verbindung hergestellt werden, da der Zielcomputer die Verbindung verweigerte',)': /simple/ipykernel/
INFO:pip9._vendor.requests.packages.urllib3.connectionpool:Starting new HTTPS connection (6): pypi.org
Traceback (most recent call last):
File "e:\python3\lib\site-packages\pipenv\vendor\pip9\_vendor\requests\packages\urllib3\connection.py", line 142, in _new_conn
(self.host, self.port), self.timeout, **extra_kw)
File "e:\python3\lib\site-packages\pipenv\vendor\pip9\_vendor\requests\packages\urllib3\util\connection.py", line 98, in create_connection
raise err
File "e:\python3\lib\site-packages\pipenv\vendor\pip9\_vendor\requests\packages\urllib3\util\connection.py", line 88, in create_connection
sock.connect(sa)
I guess, it is closely related to the following issue on github: https://github.com/pypa/pipenv/issues/1783
EDIT:
It seems like running pipenv install --skip-lock
solves the issue when running against devpi (or something similar) without having access to pypi.org. This was at least the solution for me (with pipenv 11.10.0 and python 3.6.4)