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pip install raise ValueError("check_hostname requires server_hostname") while VPN is on

pip install <package> gives exception.
raise ValueError("check_hostname requires server_hostname")
ValueError: check_hostname requires server_hostname
while VPN is on, let say. My only option is VPN. I can not turn it off. How to solve this problem.
Pip Version pip 21.1.1 Python 3.9.5 Conda version conda 4.10.1
Here is a full exception.
WARNING: Ignoring invalid distribution -rllib3 (c:\programdata\anaconda3\envs\pycharm\lib\site-packages)
WARNING: Ignoring invalid distribution -rllib3 (c:\programdata\anaconda3\envs\pycharm\lib\site-packages)
ERROR: Exception:
Traceback (most recent call last):
File "C:\ProgramData\Anaconda3\envs\PyCharm\lib\site-packages\pip\_internal\cli\base_command.py", line 180, in _main
status = self.run(options, args)
File "C:\ProgramData\Anaconda3\envs\PyCharm\lib\site-packages\pip\_internal\cli\req_command.py", line 204, in wrapper
return func(self, options, args)
File "C:\ProgramData\Anaconda3\envs\PyCharm\lib\site-packages\pip\_internal\commands\install.py", line 318, in run
requirement_set = resolver.resolve(
File "C:\ProgramData\Anaconda3\envs\PyCharm\lib\site-packages\pip\_internal\resolution\resolvelib\resolver.py", line 127, in resolve
result = self._result = resolver.resolve(
File "C:\ProgramData\Anaconda3\envs\PyCharm\lib\site-packages\pip\_vendor\resolvelib\resolvers.py", line 473, in resolve
state = resolution.resolve(requirements, max_rounds=max_rounds)
File "C:\ProgramData\Anaconda3\envs\PyCharm\lib\site-packages\pip\_vendor\resolvelib\resolvers.py", line 341, in resolve
name, crit = self._merge_into_criterion(r, parent=None)
File "C:\ProgramData\Anaconda3\envs\PyCharm\lib\site-packages\pip\_vendor\resolvelib\resolvers.py", line 172, in _merge_into_criterion
if not criterion.candidates:
File "C:\ProgramData\Anaconda3\envs\PyCharm\lib\site-packages\pip\_vendor\resolvelib\structs.py", line 139, in __bool__
return bool(self._sequence)
File "C:\ProgramData\Anaconda3\envs\PyCharm\lib\site-packages\pip\_internal\resolution\resolvelib\found_candidates.py", line 143, in __bool__
return any(self)
File "C:\ProgramData\Anaconda3\envs\PyCharm\lib\site-packages\pip\_internal\resolution\resolvelib\found_candidates.py", line 129, in <genexpr>
return (c for c in iterator if id(c) not in self._incompatible_ids)
File "C:\ProgramData\Anaconda3\envs\PyCharm\lib\site-packages\pip\_internal\resolution\resolvelib\found_candidates.py", line 30, in _iter_built
for version, func in infos:
File "C:\ProgramData\Anaconda3\envs\PyCharm\lib\site-packages\pip\_internal\resolution\resolvelib\factory.py", line 258, in iter_index_candidate_infos
result = self._finder.find_best_candidate(
File "C:\ProgramData\Anaconda3\envs\PyCharm\lib\site-packages\pip\_internal\index\package_finder.py", line 879, in find_best_candidate
candidates = self.find_all_candidates(project_name)
File "C:\ProgramData\Anaconda3\envs\PyCharm\lib\site-packages\pip\_internal\index\package_finder.py", line 824, in find_all_candidates
page_candidates = list(page_candidates_it)
File "C:\ProgramData\Anaconda3\envs\PyCharm\lib\site-packages\pip\_internal\index\sources.py", line 134, in page_candidates
yield from self._candidates_from_page(self._link)
File "C:\ProgramData\Anaconda3\envs\PyCharm\lib\site-packages\pip\_internal\index\package_finder.py", line 783, in process_project_url
html_page = self._link_collector.fetch_page(project_url)
File "C:\ProgramData\Anaconda3\envs\PyCharm\lib\site-packages\pip\_internal\index\collector.py", line 512, in fetch_page
return _get_html_page(location, session=self.session)
File "C:\ProgramData\Anaconda3\envs\PyCharm\lib\site-packages\pip\_internal\index\collector.py", line 422, in _get_html_page
resp = _get_html_response(url, session=session)
File "C:\ProgramData\Anaconda3\envs\PyCharm\lib\site-packages\pip\_internal\index\collector.py", line 120, in _get_html_response
resp = session.get(
File "C:\ProgramData\Anaconda3\envs\PyCharm\lib\site-packages\pip\_vendor\requests\sessions.py", line 555, in get
return self.request('GET', url, **kwargs)
File "C:\ProgramData\Anaconda3\envs\PyCharm\lib\site-packages\pip\_internal\network\session.py", line 449, in request
return super().request(method, url, *args, **kwargs)
File "C:\ProgramData\Anaconda3\envs\PyCharm\lib\site-packages\pip\_vendor\requests\sessions.py", line 542, in request
resp = self.send(prep, **send_kwargs)
File "C:\ProgramData\Anaconda3\envs\PyCharm\lib\site-packages\pip\_vendor\requests\sessions.py", line 655, in send
r = adapter.send(request, **kwargs)
File "C:\ProgramData\Anaconda3\envs\PyCharm\lib\site-packages\pip\_vendor\cachecontrol\adapter.py", line 53, in send
resp = super(CacheControlAdapter, self).send(request, **kw)
File "C:\ProgramData\Anaconda3\envs\PyCharm\lib\site-packages\pip\_vendor\requests\adapters.py", line 439, in send
resp = conn.urlopen(
File "C:\ProgramData\Anaconda3\envs\PyCharm\lib\site-packages\pip\_vendor\urllib3\connectionpool.py", line 696, in urlopen
self._prepare_proxy(conn)
File "C:\ProgramData\Anaconda3\envs\PyCharm\lib\site-packages\pip\_vendor\urllib3\connectionpool.py", line 964, in _prepare_proxy
conn.connect()
File "C:\ProgramData\Anaconda3\envs\PyCharm\lib\site-packages\pip\_vendor\urllib3\connection.py", line 359, in connect
conn = self._connect_tls_proxy(hostname, conn)
File "C:\ProgramData\Anaconda3\envs\PyCharm\lib\site-packages\pip\_vendor\urllib3\connection.py", line 500, in _connect_tls_proxy
return ssl_wrap_socket(
File "C:\ProgramData\Anaconda3\envs\PyCharm\lib\site-packages\pip\_vendor\urllib3\util\ssl_.py", line 432, in ssl_wrap_socket
ssl_sock = _ssl_wrap_socket_impl(sock, context, tls_in_tls)
File "C:\ProgramData\Anaconda3\envs\PyCharm\lib\site-packages\pip\_vendor\urllib3\util\ssl_.py", line 474, in _ssl_wrap_socket_impl
return ssl_context.wrap_socket(sock)
File "C:\ProgramData\Anaconda3\envs\PyCharm\lib\ssl.py", line 500, in wrap_socket
return self.sslsocket_class._create(
File "C:\ProgramData\Anaconda3\envs\PyCharm\lib\ssl.py", line 997, in _create
raise ValueError("check_hostname requires server_hostname")
ValueError: check_hostname requires server_hostname
WARNING: Ignoring invalid distribution -rllib3 (c:\programdata\anaconda3\envs\pycharm\lib\site-packages)
WARNING: Ignoring invalid distribution -rllib3 (c:\programdata\anaconda3\envs\pycharm\lib\site-packages)
WARNING: Ignoring invalid distribution -rllib3 (c:\programdata\anaconda3\envs\pycharm\lib\site-packages)

You should try execute pip with --proxy paramenter like this:
pip --proxy <proxy> install <module>
Or you can try setting up environment-variables as explainded here https://pip.pypa.io/en/stable/user_guide/?highlight=proxy#using-a-proxy-server
Nevertheless, using a VPN should not prompt this kind of problemns, probably it's not well configured therefore, all the traffic doesn't go through it.
Check that you have your 0.0.0.0 IP route pointing to the vpn first.

If you use VPN try to disconnect it, it will solve the problem. VPN changes the proxy server setting.

Only solution for me was to upgrade pip via whl.
Download the latest whl and then pip installed the pip upgrade (pip-21.2.4-py3-none-any.whl) from the whl.
Once I upgraded PIP, then PIP could install as expected.
Copying additional detail from comment as per request.
Go to pypi.org and search for pip.py (pypi.org/search/?q=pip.py&o=). Download the file to your local computer (pip-21.2.4-py3-none-any.whl). Then, at prompt, "pip install ". It fixed mine. Hopefully it does yours too!

There is another better way to solve this.
Just need to upgrade pip version by using:
python -m pip install --upgrade pip

How to completely remove and install again PIP on MacOS Sierra (10.x)?

Had PIP working normally until few days ago.
Not sure how.
Trying to run it now and now show issues.
Adding full stack bellow of the error:
Exception:
Traceback (most recent call last):
File "/usr/local/lib/python2.7/site-packages/pip/basecommand.py", line 215, in main
status = self.run(options, args)
File "/usr/local/lib/python2.7/site-packages/pip/commands/install.py", line 335, in run
wb.build(autobuilding=True)
File "/usr/local/lib/python2.7/site-packages/pip/wheel.py", line 749, in build
self.requirement_set.prepare_files(self.finder)
File "/usr/local/lib/python2.7/site-packages/pip/req/req_set.py", line 380, in prepare_files
ignore_dependencies=self.ignore_dependencies))
File "/usr/local/lib/python2.7/site-packages/pip/req/req_set.py", line 487, in _prepare_file
req_to_install, finder)
File "/usr/local/lib/python2.7/site-packages/pip/req/req_set.py", line 428, in _check_skip_installed
req_to_install, upgrade_allowed)
File "/usr/local/lib/python2.7/site-packages/pip/index.py", line 465, in find_requirement
all_candidates = self.find_all_candidates(req.name)
File "/usr/local/lib/python2.7/site-packages/pip/index.py", line 423, in find_all_candidates
for page in self._get_pages(url_locations, project_name):
File "/usr/local/lib/python2.7/site-packages/pip/index.py", line 568, in _get_pages
page = self._get_page(location)
File "/usr/local/lib/python2.7/site-packages/pip/index.py", line 683, in _get_page
return HTMLPage.get_page(link, session=self.session)
File "/usr/local/lib/python2.7/site-packages/pip/index.py", line 792, in get_page
"Cache-Control": "max-age=600",
File "/usr/local/lib/python2.7/site-packages/pip/_vendor/requests/sessions.py", line 488, in get
return self.request('GET', url, **kwargs)
File "/usr/local/lib/python2.7/site-packages/pip/download.py", line 386, in request
return super(PipSession, self).request(method, url, *args, **kwargs)
File "/usr/local/lib/python2.7/site-packages/pip/_vendor/requests/sessions.py", line 475, in request
resp = self.send(prep, **send_kwargs)
File "/usr/local/lib/python2.7/site-packages/pip/_vendor/requests/sessions.py", line 596, in send
r = adapter.send(request, **kwargs)
File "/usr/local/lib/python2.7/site-packages/pip/_vendor/cachecontrol/adapter.py", line 47, in send
resp = super(CacheControlAdapter, self).send(request, **kw)
File "/usr/local/lib/python2.7/site-packages/pip/_vendor/requests/adapters.py", line 390, in send
conn = self.get_connection(request.url, proxies)
File "/usr/local/lib/python2.7/site-packages/pip/_vendor/requests/adapters.py", line 290, in get_connection
proxy_manager = self.proxy_manager_for(proxy)
File "/usr/local/lib/python2.7/site-packages/pip/_vendor/requests/adapters.py", line 194, in proxy_manager_for
**proxy_kwargs)
File "/usr/local/lib/python2.7/site-packages/pip/_vendor/requests/packages/urllib3/poolmanager.py", line 367, in proxy_from_url
return ProxyManager(proxy_url=url, **kw)
File "/usr/local/lib/python2.7/site-packages/pip/_vendor/requests/packages/urllib3/poolmanager.py", line 312, in __init__
proxy = parse_url(proxy_url)
File "/usr/local/lib/python2.7/site-packages/pip/_vendor/requests/packages/urllib3/util/url.py", line 189, in parse_url
raise LocationParseError(url)
LocationParseError: Failed to parse: user:pass
Want to try to reinstall pip completely.
What is recommended way to do it?

Your pip and Python installations are fine. What's wrong is your proxy configuration.
On OS X, both environment variables and the OS X network configuration can supply proxy information. First find out what configuration you have with:
python2.7 -c 'import urllib, pprint; pprint.pprint(urllib.getproxies())'
then look for any incorrect configuration in both your network settings (in the system configuration, check active networks for the proxies tab), and in your environment variables for *_proxy entries (http_proxy, https_proxy, etc.).
You can manually override proxies by setting one on the command line with the --proxy switch:
pip --proxy= install ...
Note the empty --proxy=; or you can set a specific proxy.
If you really did need to re-install your Python setup, you appear to have installed yours with Homebrew, so you can re-install it with brew install -f python#2.

Download Anaconda (or Miniconda), run it, and restart your terminal then start using environments.
to create an environment type
conda create -n my_project_name python=3.6
conda activate my_project_name
Now do all the pip installs and conda installs you want.
Your path is fixed. Pip is fixed. Go crazy.
Edit:
Now that you've posted your full traceback it looks like you need to feed the proxy a username and password. Here is one way to do it.
pip install --proxy=https://user#mydomain:port somepackage

Python -pip install Exception for any Libary\Package i'm trying to install

Im using Python 2.7 on windows 8.1, using Visual Studio as f.w
Anyway,
After installing python and some packages couple of days ago, I'm unable anymore to pip install packages (Any of them -Just name it) and keep getting the exception below, which contains tens of error
P.S :
No changes were done in my environment.
I have tried to upgrade pip as well and got same error
Thanks for the help
The same error i'm getting all time:
----- Installing 'webdriver' -----
Collecting webdriver
Exception:
Traceback (most recent call last):
File "C:\Python27\lib\site-packages\pip\basecommand.py", line 211, in main
status = self.run(options, args)
File "C:\Python27\lib\site-packages\pip\commands\install.py", line 294, in run
requirement_set.prepare_files(finder)
File "C:\Python27\lib\site-packages\pip\req\req_set.py", line 334, in
prepare_files
functools.partial(self._prepare_file, finder))
File "C:\Python27\lib\site-packages\pip\req\req_set.py", line 321, in
_walk_req_to_install
more_reqs = handler(req_to_install)
File "C:\Python27\lib\site-packages\pip\req\req_set.py", line 461, in
_prepare_file
req_to_install.populate_link(finder, self.upgrade)
File "C:\Python27\lib\site-packages\pip\req\req_install.py", line 250, in
populate_link
self.link = finder.find_requirement(self, upgrade)
File "C:\Python27\lib\site-packages\pip\index.py", line 486, in
find_requirement
all_versions = self._find_all_versions(req.name)
File "C:\Python27\lib\site-packages\pip\index.py", line 404, in
_find_all_versions
index_locations = self._get_index_urls_locations(project_name)
File "C:\Python27\lib\site-packages\pip\index.py", line 378, in
_get_index_urls_locations
page = self._get_page(main_index_url)
File "C:\Python27\lib\site-packages\pip\index.py", line 818, in _get_page
return HTMLPage.get_page(link, session=self.session)
File "C:\Python27\lib\site-packages\pip\index.py", line 949, in get_page
trusted=link.trusted,
File "C:\Python27\lib\site-packages\pip\index.py", line 866, in __init__
namespaceHTMLElements=False,
File "C:\Python27\lib\site-packages\pip\_vendor\html5lib\html5parser.py",
line 27, in parse
tb = treebuilders.getTreeBuilder(treebuilder)
File "C:\Python27\lib\site-
packages\pip\_vendor\html5lib\treebuilders\__init__.py", line 73, in
getTreeBuilder
return etree.getETreeModule(implementation, **kwargs).TreeBuilder
File "C:\Python27\lib\site-packages\pip\_vendor\html5lib\utils.py", line 98,
in moduleFactory
objs = factory(baseModule, *args, **kwargs)
File "C:\Python27\lib\site-
packages\pip\_vendor\html5lib\treebuilders\etree.py", line 17, in
getETreeBuilder
ElementTreeCommentType = ElementTree.Comment("asd").tag
AttributeError: 'module' object has no attribute 'Comment'
You are using pip version 7.1.2, however version 8.0.0 is available.
You should consider upgrading via the 'python -m pip install --upgrade pip'
command.

Proxy Error in nova docker installation

When I install nova-docker from github repositories it runs setup.py; from that script some packages are downloaded and installed but after that it raises a ProxyError during the installation.
Downloading unittest2-1.0.1-py2.py3-none-any.whl (95kB): 95kB downloaded
Downloading/unpacking linecache2 (from traceback2->testtools>=0.9.22->fixtures>=0.3.14->oslo.concurrency>=0.1.0)
Cleaning up...
Exception:
Traceback (most recent call last):
File "/usr/lib/python2.7/site-packages/pip/basecommand.py", line 122, in main
status = self.run(options, args)
File "/usr/lib/python2.7/site-packages/pip/commands/install.py", line 298, in run
requirement_set.prepare_files(finder, force_root_egg_info=self.bundle, bundle=self.bundle)
File "/usr/lib/python2.7/site-packages/pip/req.py", line 1202, in prepare_files
do_download,
File "/usr/lib/python2.7/site-packages/pip/req.py", line 1380, in unpack_url
self.session,
File "/usr/lib/python2.7/site-packages/pip/download.py", line 546, in unpack_http_url
resp = session.get(target_url, stream=True)
File "/usr/lib/python2.7/site-packages/pip/_vendor/requests/sessions.py", line 468, in get
return self.request('GET', url, **kwargs)
File "/usr/lib/python2.7/site-packages/pip/download.py", line 237, in request
return super(PipSession, self).request(method, url, *args, **kwargs)
File "/usr/lib/python2.7/site-packages/pip/_vendor/requests/sessions.py", line 456, in request
resp = self.send(prep, **send_kwargs)
File "/usr/lib/python2.7/site-packages/pip/_vendor/requests/sessions.py", line 559, in send
r = adapter.send(request, **kwargs)
File "/usr/lib/python2.7/site-packages/pip/_vendor/requests/adapters.py", line 378, in send
raise ProxyError(e)
ProxyError: ('Cannot connect to proxy.', gaierror(-2, 'Name or service not known'))
Storing debug log for failure in /root/.pip/pip.log
error: /bin/python -m pip.__init__ install 'pbr>=0.5.21,<1.0' 'Babel>=1.3' 'six>=1.7.0' 'oslo.serialization>=1.0.0 # Apache-2.0' 'oslo.utils>=1.0.0 # Apache-2.0' 'oslo.config>=1.4.0 # Apache-2.0' 'oslo.concurrency>=0.1.0 # Apache-2.0' 'docker-py>=0.5.1' returned 2

put proxy setting in bash file of centos.
export http_proxy="http://PROXY=USERNAME=HERE:PROXY=PASSWORD=HERE#URL:PORT"
export https_proxy="https://PROXY=USERNAME=HERE:PROXY=PASSWORD=HERE#URL:PORT"
export ftp_proxy="ftp://PROXY=USERNAME=HERE:PROXY=PASSWORD=HERE#URL:PORT"

why i failed to install django, should i run pip install for more times?

(py) D:\python>pip install django
Downloading/unpacking django
Downloading Django-1.4.1.tar.gz (7.7MB): 491kB downloaded
Exception:
Traceback (most recent call last):
File "D:\python\py\lib\site-packages\pip-1.2.1-py2.7.egg\pip\basecommand.py",
line 107, in main
status = self.run(options, args)
File "D:\python\py\lib\site-packages\pip-1.2.1-py2.7.egg\pip\commands\install.
py", line 256, in run
requirement_set.prepare_files(finder, force_root_egg_info=self.bundle, bundl
e=self.bundle)
File "D:\python\py\lib\site-packages\pip-1.2.1-py2.7.egg\pip\req.py", line 101
8, in prepare_files
self.unpack_url(url, location, self.is_download)
File "D:\python\py\lib\site-packages\pip-1.2.1-py2.7.egg\pip\req.py", line 114
2, in unpack_url
retval = unpack_http_url(link, location, self.download_cache, self.download_
dir)
File "D:\python\py\lib\site-packages\pip-1.2.1-py2.7.egg\pip\download.py", lin
e 463, in unpack_http_url
download_hash = _download_url(resp, link, temp_location)
File "D:\python\py\lib\site-packages\pip-1.2.1-py2.7.egg\pip\download.py", lin
e 380, in _download_url
chunk = resp.read(4096)
File "C:\Python27\Lib\socket.py", line 378, in read
data = self._sock.recv(left)
File "C:\Python27\Lib\httplib.py", line 552, in read
s = self.fp.read(amt)
File "C:\Python27\Lib\socket.py", line 378, in read
data = self._sock.recv(left)
timeout: timed out
Storing complete log in C:\Users\bigmeow\pip\pip.log
where does pip store Django-1.4.1.tar.gz when it is downloaded?

Installation failed in download phase. You should answer the following questions:
Are you connected to the internet?
Are you using a proxy for internet connection? If you do, add a environment variable http_proxy=http://user:pass#my.site:port/