Installation error : WGET Unable to establish SSL connection for bootstrap.pypa.io

1 
Resolving bootstrap.pypa.io (bootstrap.pypa.io)... 151.101.0.175, 151.101.64.175, 151.101.128.175, ...
Connecting to bootstrap.pypa.io (bootstrap.pypa.io)|151.101.0.175|:443... connected.
Unable to establish SSL connection.
Traceback (most recent call last):
  File "install.py", line 425, in <module>
    install_bench(args)
  File "install.py", line 45, in install_bench
    'wget': 'wget https://bootstrap.pypa.io/get-pip.py'
  File "install.py", line 234, in run_os_command
    returncode = subprocess.check_call(command, shell=True)
  File "/usr/lib/python2.7/subprocess.py", line 541, in check_call
    raise CalledProcessError(retcode, cmd)
subprocess.CalledProcessError: Command 'wget https://bootstrap.pypa.io/get-pip.py' returned non-zero exit status 4

I’m trying to install erpnext on fresh ubuntu 14 servers and getting above error. My ssl is using the protocol of TSL1.
Do anyone have any Idea on this error?

2

Is your openssl library up to date? You could work around this by adding to the wget command…

wget --no-check-certificate https://www…

but this doesn’t really solve the problem.
You could also try to use flags like
–secure-protocol=TLSv1

Maybe check if you can access the site with

openssl s_client -connect …

or with

openssl s_client -tls1 -no_tls1_1, -no_tls1_2 …