ERROR

[ghost]

Environment

• pip version: 20.3.3
• Python version: 3.8.6 Anaconda3
• OS: Windows 10 20H2

Description
I can't use pip to install any packages or search for them.

How to Reproduce

pip search pyside6

Output
During handling of the above exception, another exception occurred:

WARNING: Retrying (Retry(total=4, connect=None, read=None, redirect=None, status=None)) after connection broken by 'SSLError(SSLEOFError(8, 'EOF occurred in violation of protocol (_ssl.c:1124)'))': /pypi
WARNING: Retrying (Retry(total=3, connect=None, read=None, redirect=None, status=None)) after connection broken by 'SSLError(SSLEOFError(8, 'EOF occurred in violation of protocol (_ssl.c:1124)'))': /pypi
WARNING: Retrying (Retry(total=2, connect=None, read=None, redirect=None, status=None)) after connection broken by 'SSLError(SSLEOFError(8, 'EOF occurred in violation of protocol (_ssl.c:1124)'))': /pypi
WARNING: Retrying (Retry(total=1, connect=None, read=None, redirect=None, status=None)) after connection broken by 'SSLError(SSLEOFError(8, 'EOF occurred in violation of protocol (_ssl.c:1124)'))': /pypi
WARNING: Retrying (Retry(total=0, connect=None, read=None, redirect=None, status=None)) after connection broken by 'SSLError(SSLEOFError(8, 'EOF occurred in violation of protocol (_ssl.c:1124)'))': /pypi
ERROR: Exception:
Traceback (most recent call last):
  File "D:\Programs\Anaconda3\lib\site-packages\pip\_vendor\urllib3\connectionpool.py", line 696, in urlopen
    self._prepare_proxy(conn)
  File "D:\Programs\Anaconda3\lib\site-packages\pip\_vendor\urllib3\connectionpool.py", line 964, in _prepare_proxy
    conn.connect()
  File "D:\Programs\Anaconda3\lib\site-packages\pip\_vendor\urllib3\connection.py", line 359, in connect
    conn = self._connect_tls_proxy(hostname, conn)
  File "D:\Programs\Anaconda3\lib\site-packages\pip\_vendor\urllib3\connection.py", line 496, in _connect_tls_proxy
    return ssl_wrap_socket(
  File "D:\Programs\Anaconda3\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 "D:\Programs\Anaconda3\lib\site-packages\pip\_vendor\urllib3\util\ssl_.py", line 474, in _ssl_wrap_socket_impl
    return ssl_context.wrap_socket(sock)
  File "D:\Programs\Anaconda3\lib\ssl.py", line 500, in wrap_socket
    return self.sslsocket_class._create(
  File "D:\Programs\Anaconda3\lib\ssl.py", line 1040, in _create
    self.do_handshake()
  File "D:\Programs\Anaconda3\lib\ssl.py", line 1309, in do_handshake
    self._sslobj.do_handshake()
ssl.SSLEOFError: EOF occurred in violation of protocol (_ssl.c:1124)

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "D:\Programs\Anaconda3\lib\site-packages\pip\_vendor\requests\adapters.py", line 439, in send
    resp = conn.urlopen(
  File "D:\Programs\Anaconda3\lib\site-packages\pip\_vendor\urllib3\connectionpool.py", line 783, in urlopen
    return self.urlopen(
  File "D:\Programs\Anaconda3\lib\site-packages\pip\_vendor\urllib3\connectionpool.py", line 783, in urlopen
    return self.urlopen(
  File "D:\Programs\Anaconda3\lib\site-packages\pip\_vendor\urllib3\connectionpool.py", line 783, in urlopen
    return self.urlopen(
  [Previous line repeated 2 more times]
  File "D:\Programs\Anaconda3\lib\site-packages\pip\_vendor\urllib3\connectionpool.py", line 755, in urlopen
    retries = retries.increment(
  File "D:\Programs\Anaconda3\lib\site-packages\pip\_vendor\urllib3\util\retry.py", line 573, in increment
    raise MaxRetryError(_pool, url, error or ResponseError(cause))
pip._vendor.urllib3.exceptions.MaxRetryError: HTTPSConnectionPool(host='pypi.org', port=443): Max retries exceeded with url: /pypi (Caused by SSLError(SSLEOFError(8, 'EOF occurred in violation of protocol (_ssl.c:1124)')))

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "D:\Programs\Anaconda3\lib\site-packages\pip\_internal\cli\base_command.py", line 224, in _main
    status = self.run(options, args)
  File "D:\Programs\Anaconda3\lib\site-packages\pip\_internal\commands\search.py", line 62, in run
    pypi_hits = self.search(query, options)
  File "D:\Programs\Anaconda3\lib\site-packages\pip\_internal\commands\search.py", line 82, in search
    hits = pypi.search({'name': query, 'summary': query}, 'or')
  File "D:\Programs\Anaconda3\lib\xmlrpc\client.py", line 1109, in __call__
    return self.__send(self.__name, args)
  File "D:\Programs\Anaconda3\lib\xmlrpc\client.py", line 1450, in __request
    response = self.__transport.request(
  File "D:\Programs\Anaconda3\lib\site-packages\pip\_internal\network\xmlrpc.py", line 42, in request
    response = self._session.post(url, data=request_body,
  File "D:\Programs\Anaconda3\lib\site-packages\pip\_vendor\requests\sessions.py", line 590, in post
    return self.request('POST', url, data=data, json=json, **kwargs)
  File "D:\Programs\Anaconda3\lib\site-packages\pip\_internal\network\session.py", line 428, in request
    return super(PipSession, self).request(method, url, *args, **kwargs)
  File "D:\Programs\Anaconda3\lib\site-packages\pip\_vendor\requests\sessions.py", line 542, in request
    resp = self.send(prep, **send_kwargs)
  File "D:\Programs\Anaconda3\lib\site-packages\pip\_vendor\requests\sessions.py", line 655, in send
    r = adapter.send(request, **kwargs)
  File "D:\Programs\Anaconda3\lib\site-packages\pip\_vendor\cachecontrol\adapter.py", line 53, in send
    resp = super(CacheControlAdapter, self).send(request, **kw)
  File "D:\Programs\Anaconda3\lib\site-packages\pip\_vendor\requests\adapters.py", line 514, in send
    raise SSLError(e, request=request)
pip._vendor.requests.exceptions.SSLError: HTTPSConnectionPool(host='pypi.org', port=443): Max retries exceeded with url: /pypi (Caused by SSLError(SSLEOFError(8, 'EOF occurred in violation of protocol (_ssl.c:1124)')))

[pradyunsg]

Similar vein as #9324. Closing since the underlying cause is likely the same.