Pip: sudo pip install encountered NewConnectionError

[anonymouss]

• Pip version: 9.0.1
• Python version: 2.7.6
• Operating system: Ubuntu 14.04.5

Description:

I'm trying to install flask in Ubuntu.
If I use pip install flask, packages can be downloaded successfully, but installation will encounter permission issue.
So, I tried sudo -H pip install flask. however, packages can't even be downloaded now...
error information as below:

  Retrying (Retry(total=4, connect=None, read=None, redirect=None)) after connection broken by 'NewConnectionError('<pip._vendor.requests.packages.urllib3.connection.VerifiedHTTPSConnection object at 0x7f1ebfdc3dd0>: Failed to establish a new connection: [Errno 101] Network is unreachable',)': /simple/flask/
  Retrying (Retry(total=3, connect=None, read=None, redirect=None)) after connection broken by 'NewConnectionError('<pip._vendor.requests.packages.urllib3.connection.VerifiedHTTPSConnection object at 0x7f1ebfe0ee90>: Failed to establish a new connection: [Errno 101] Network is unreachable',)': /simple/flask/
  Retrying (Retry(total=2, connect=None, read=None, redirect=None)) after connection broken by 'NewConnectionError('<pip._vendor.requests.packages.urllib3.connection.VerifiedHTTPSConnection object at 0x7f1ebfe0edd0>: Failed to establish a new connection: [Errno 101] Network is unreachable',)': /simple/flask/
  Retrying (Retry(total=1, connect=None, read=None, redirect=None)) after connection broken by 'NewConnectionError('<pip._vendor.requests.packages.urllib3.connection.VerifiedHTTPSConnection object at 0x7f1ebfe0ecd0>: Failed to establish a new connection: [Errno 101] Network is unreachable',)': /simple/flask/
  Retrying (Retry(total=0, connect=None, read=None, redirect=None)) after connection broken by 'NewConnectionError('<pip._vendor.requests.packages.urllib3.connection.VerifiedHTTPSConnection object at 0x7f1ebfd59750>: Failed to establish a new connection: [Errno 101] Network is unreachable',)': /simple/flask/
  Could not find a version that satisfies the requirement flask (from versions: )
No matching distribution found for flask

Note: issue not only occurs in flask

What I've run:

I've tried to modify /etc/resolv.conf, add nameserver 8.8.8.8 & nameserver 8.8.4.4, it doesn't work.

Thanks

[anonymouss]

oh... I got solution!
sudo -H pip install flask --proxy="my_proxy_name:port"

[shiplu]

why do we need to use proxy?

[anonymouss]

maybe it's beacuse some websites are blocked in my region, while this package happens to store data in one of this sites...
It's just a possible way to solve such connection issue and it happened to be workable to me. You don't need to do this if you don't have this issue.

[cjonesii]

Thanks! This helped.

[lming08]

you can check the network if work

[deividsoncs]

Thanks!

[Sayaksam]

why do we need to use proxy?

@shiplu, https://www.quora.com/Why-do-we-use-proxy-servers
This might help

[lock[bot]]

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