When you run the pip command to install, uninstall a python package, you may encounter the error message ValueError: check_hostname requires server_hostname like below. This article will tell you how to fix it.
1. The Detail Message Of The ValueError: Check_hostname Requires Server_HostName.
- Below is the detailed error message of this error.
ERROR: Exception: Traceback (most recent call last): File "C:\Users\zhaosong\anaconda3\envs\MyPythonEnv\lib\site-packages\pip\_internal\cli\base_command.py", line 173, in _main status = self.run(options, args) File "C:\Users\zhaosong\anaconda3\envs\MyPythonEnv\lib\site-packages\pip\_internal\cli\req_command.py", line 203, in wrapper return func(self, options, args) File "C:\Users\zhaosong\anaconda3\envs\MyPythonEnv\lib\site-packages\pip\_internal\commands\install.py", line 315, in run requirement_set = resolver.resolve( File "C:\Users\zhaosong\anaconda3\envs\MyPythonEnv\lib\site-packages\pip\_internal\resolution\resolvelib\resolver.py", line 94, in resolve result = self._result = resolver.resolve( File "C:\Users\zhaosong\anaconda3\envs\MyPythonEnv\lib\site-packages\pip\_vendor\resolvelib\resolvers.py", line 472, in resolve state = resolution.resolve(requirements, max_rounds=max_rounds) File "C:\Users\zhaosong\anaconda3\envs\MyPythonEnv\lib\site-packages\pip\_vendor\resolvelib\resolvers.py", line 341, in resolve self._add_to_criteria(self.state.criteria, r, parent=None) File "C:\Users\zhaosong\anaconda3\envs\MyPythonEnv\lib\site-packages\pip\_vendor\resolvelib\resolvers.py", line 172, in _add_to_criteria if not criterion.candidates: File "C:\Users\zhaosong\anaconda3\envs\MyPythonEnv\lib\site-packages\pip\_vendor\resolvelib\structs.py", line 151, in __bool__ return bool(self._sequence) File "C:\Users\zhaosong\anaconda3\envs\MyPythonEnv\lib\site-packages\pip\_internal\resolution\resolvelib\found_candidates.py", line 140, in __bool__ return any(self) File "C:\Users\zhaosong\anaconda3\envs\MyPythonEnv\lib\site-packages\pip\_internal\resolution\resolvelib\found_candidates.py", line 128, in <genexpr> return (c for c in iterator if id(c) not in self._incompatible_ids) File "C:\Users\zhaosong\anaconda3\envs\MyPythonEnv\lib\site-packages\pip\_internal\resolution\resolvelib\found_candidates.py", line 29, in _iter_built for version, func in infos: File "C:\Users\zhaosong\anaconda3\envs\MyPythonEnv\lib\site-packages\pip\_internal\resolution\resolvelib\factory.py", line 272, in iter_index_candidate_infos result = self._finder.find_best_candidate( File "C:\Users\zhaosong\anaconda3\envs\MyPythonEnv\lib\site-packages\pip\_internal\index\package_finder.py", line 851, in find_best_candidate candidates = self.find_all_candidates(project_name) File "C:\Users\zhaosong\anaconda3\envs\MyPythonEnv\lib\site-packages\pip\_internal\index\package_finder.py", line 798, in find_all_candidates page_candidates = list(page_candidates_it) File "C:\Users\zhaosong\anaconda3\envs\MyPythonEnv\lib\site-packages\pip\_internal\index\sources.py", line 134, in page_candidates yield from self._candidates_from_page(self._link) File "C:\Users\zhaosong\anaconda3\envs\MyPythonEnv\lib\site-packages\pip\_internal\index\package_finder.py", line 758, in process_project_url html_page = self._link_collector.fetch_page(project_url) File "C:\Users\zhaosong\anaconda3\envs\MyPythonEnv\lib\site-packages\pip\_internal\index\collector.py", line 490, in fetch_page return _get_html_page(location, session=self.session) File "C:\Users\zhaosong\anaconda3\envs\MyPythonEnv\lib\site-packages\pip\_internal\index\collector.py", line 400, in _get_html_page resp = _get_html_response(url, session=session) File "C:\Users\zhaosong\anaconda3\envs\MyPythonEnv\lib\site-packages\pip\_internal\index\collector.py", line 115, in _get_html_response resp = session.get( File "C:\Users\zhaosong\anaconda3\envs\MyPythonEnv\lib\site-packages\pip\_vendor\requests\sessions.py", line 555, in get return self.request('GET', url, **kwargs) File "C:\Users\zhaosong\anaconda3\envs\MyPythonEnv\lib\site-packages\pip\_internal\network\session.py", line 454, in request return super().request(method, url, *args, **kwargs) File "C:\Users\zhaosong\anaconda3\envs\MyPythonEnv\lib\site-packages\pip\_vendor\requests\sessions.py", line 542, in request resp = self.send(prep, **send_kwargs) File "C:\Users\zhaosong\anaconda3\envs\MyPythonEnv\lib\site-packages\pip\_vendor\requests\sessions.py", line 655, in send r = adapter.send(request, **kwargs) File "C:\Users\zhaosong\anaconda3\envs\MyPythonEnv\lib\site-packages\pip\_vendor\cachecontrol\adapter.py", line 53, in send resp = super(CacheControlAdapter, self).send(request, **kw) File "C:\Users\zhaosong\anaconda3\envs\MyPythonEnv\lib\site-packages\pip\_vendor\requests\adapters.py", line 439, in send resp = conn.urlopen( File "C:\Users\zhaosong\anaconda3\envs\MyPythonEnv\lib\site-packages\pip\_vendor\urllib3\connectionpool.py", line 696, in urlopen self._prepare_proxy(conn) File "C:\Users\zhaosong\anaconda3\envs\MyPythonEnv\lib\site-packages\pip\_vendor\urllib3\connectionpool.py", line 964, in _prepare_proxy conn.connect() File "C:\Users\zhaosong\anaconda3\envs\MyPythonEnv\lib\site-packages\pip\_vendor\urllib3\connection.py", line 359, in connect conn = self._connect_tls_proxy(hostname, conn) File "C:\Users\zhaosong\anaconda3\envs\MyPythonEnv\lib\site-packages\pip\_vendor\urllib3\connection.py", line 500, in _connect_tls_proxy return ssl_wrap_socket( File "C:\Users\zhaosong\anaconda3\envs\MyPythonEnv\lib\site-packages\pip\_vendor\urllib3\util\ssl_.py", line 453, in ssl_wrap_socket ssl_sock = _ssl_wrap_socket_impl(sock, context, tls_in_tls) File "C:\Users\zhaosong\anaconda3\envs\MyPythonEnv\lib\site-packages\pip\_vendor\urllib3\util\ssl_.py", line 495, in _ssl_wrap_socket_impl return ssl_context.wrap_socket(sock) File "C:\Users\zhaosong\anaconda3\envs\MyPythonEnv\lib\ssl.py", line 500, in wrap_socket return self.sslsocket_class._create( File "C:\Users\zhaosong\anaconda3\envs\MyPythonEnv\lib\ssl.py", line 997, in _create raise ValueError("check_hostname requires server_hostname") ValueError: check_hostname requires server_hostname
2. How To Fix The ValueError: Check_hostname Requires Server_HostName.
- This error is because you are using some proxy server ( for example SSR or v2ray) to access the internet。
- To fix the error just close and exit the proxy server that you are using. Then you can manage the python package with the pip command successfully.
3. Other Use Cases That Through This Error.
- When I start anaconda navigator, at the end of the start process, the anaconda opens a web page and I find this error on the web page, below is the detailed error message.
Report Please report this issue in the anaconda issue tracker Main Error check_hostname requires server_hostname Traceback Traceback (most recent call last): File "C:\Users\Jerry\anaconda3\lib\site-packages\anaconda_navigator\exceptions.py", line 72, in exception_handler return_value = func(*args, **kwargs) File "C:\Users\Jerry\anaconda3\lib\site-packages\anaconda_navigator\app\start.py", line 146, in start_app window = run_app(splash) File "C:\Users\Jerry\anaconda3\lib\site-packages\anaconda_navigator\app\start.py", line 65, in run_app window = MainWindow(splash=splash) File "C:\Users\Jerry\anaconda3\lib\site-packages\anaconda_navigator\widgets\main_window.py", line 165, in __init__ self.api = AnacondaAPI() File "C:\Users\Jerry\anaconda3\lib\site-packages\anaconda_navigator\api\anaconda_api.py", line 1518, in AnacondaAPI ANACONDA_API = _AnacondaAPI() File "C:\Users\Jerry\anaconda3\lib\site-packages\anaconda_navigator\api\anaconda_api.py", line 83, in __init__ self._client_api = ClientAPI(config=self.config) File "C:\Users\Jerry\anaconda3\lib\site-packages\anaconda_navigator\api\client_api.py", line 659, in ClientAPI CLIENT_API = _ClientAPI(config=config) File "C:\Users\Jerry\anaconda3\lib\site-packages\anaconda_navigator\api\client_api.py", line 95, in __init__ self.reload_client() File "C:\Users\Jerry\anaconda3\lib\site-packages\anaconda_navigator\api\client_api.py", line 326, in reload_client client.user() File "C:\Users\Jerry\anaconda3\lib\site-packages\binstar_client\__init__.py", line 244, in user res = self.session.get(url, verify=self.session.verify) File "C:\Users\Jerry\anaconda3\lib\site-packages\requests\sessions.py", line 555, in get return self.request('GET', url, **kwargs) File "C:\Users\Jerry\anaconda3\lib\site-packages\requests\sessions.py", line 542, in request resp = self.send(prep, **send_kwargs) File "C:\Users\Jerry\anaconda3\lib\site-packages\requests\sessions.py", line 655, in send r = adapter.send(request, **kwargs) File "C:\Users\Jerry\anaconda3\lib\site-packages\requests\adapters.py", line 439, in send resp = conn.urlopen( File "C:\Users\Jerry\anaconda3\lib\site-packages\urllib3\connectionpool.py", line 696, in urlopen self._prepare_proxy(conn) File "C:\Users\Jerry\anaconda3\lib\site-packages\urllib3\connectionpool.py", line 964, in _prepare_proxy conn.connect() File "C:\Users\Jerry\anaconda3\lib\site-packages\urllib3\connection.py", line 359, in connect conn = self._connect_tls_proxy(hostname, conn) File "C:\Users\Jerry\anaconda3\lib\site-packages\urllib3\connection.py", line 500, in _connect_tls_proxy return ssl_wrap_socket( File "C:\Users\Jerry\anaconda3\lib\site-packages\urllib3\util\ssl_.py", line 432, in ssl_wrap_socket ssl_sock = _ssl_wrap_socket_impl(sock, context, tls_in_tls) File "C:\Users\Jerry\anaconda3\lib\site-packages\urllib3\util\ssl_.py", line 474, in _ssl_wrap_socket_impl return ssl_context.wrap_socket(sock) File "C:\Users\Jerry\anaconda3\lib\ssl.py", line 500, in wrap_socket return self.sslsocket_class._create( File "C:\Users\Jerry\anaconda3\lib\ssl.py", line 997, in _create raise ValueError("check_hostname requires server_hostname") ValueError: check_hostname requires server_hostname - The fixing method is the same that just quitting the proxy client.
pour mon cas je dois utiliser le proxy pour sortir vers internet. est ce qu’il ya dautre solution hors la désactivation du proxy
thanks, this work for me… because i am using VPN to pass the Great Fire Wall.
This did it for me, thanks a ton!
thanks a lot