Python 警告：重试（重试（总计=4，连接=无，读取=无，重定向=无，状态=无））

我正在尝试做pip install --upgrade pip并保留
收到此错误：

WARNING: Retrying (Retry(total=4, connect=None, read=None, redirect=None, status=None)) after connection broken by 'ProxyError('Cannot connect to proxy.', NewConnection
Error('<pip._vendor.urllib3.connection.HTTPSConnection object at 0x0000026F50B448C8>: Failed to establish a new connection: [WinError 10061] No connection could be made
 because the target machine actively refused it'))': /simple/pytest/
WARNING: Retrying (Retry(total=3, connect=None, read=None, redirect=None, status=None)) after connection broken by 'ProxyError('Cannot connect to proxy.', NewConnection
Error('<pip._vendor.urllib3.connection.HTTPSConnection object at 0x0000026F50B59148>: Failed to establish a new connection: [WinError 10061] No connection could be made
 because the target machine actively refused it'))': /simple/pytest/
WARNING: Retrying (Retry(total=2, connect=None, read=None, redirect=None, status=None)) after connection broken by 'ProxyError('Cannot connect to proxy.', NewConnection
Error('<pip._vendor.urllib3.connection.HTTPSConnection object at 0x0000026F50B596C8>: Failed to establish a new connection: [WinError 10061] No connection could be made
 because the target machine actively refused it'))': /simple/pytest/
WARNING: Retrying (Retry(total=1, connect=None, read=None, redirect=None, status=None)) after connection broken by 'ProxyError('Cannot connect to proxy.', NewConnection
Error('<pip._vendor.urllib3.connection.HTTPSConnection object at 0x0000026F50B595C8>: Failed to establish a new connection: [WinError 10061] No connection could be made
 because the target machine actively refused it'))': /simple/pytest/
WARNING: Retrying (Retry(total=0, connect=None, read=None, redirect=None, status=None)) after connection broken by 'ProxyError('Cannot connect to proxy.', NewConnection
Error('<pip._vendor.urllib3.connection.HTTPSConnection object at 0x0000026F50B5F2C8>: Failed to establish a new connection: [WinError 10061] No connection could be made
 because the target machine actively refused it'))': /simple/pytest/
ERROR: Could not find a version that satisfies the requirement pytest
ERROR: No matching distribution found for pytest

另外，由于此错误，我无法安装任何新软件包。
我尝试重新安装 Pycharm 但没有成功。
我在网上尝试了一些其他建议的解决方案 - 仍然没有运气。
我知道它与 Proxy 有关，但我不熟悉它，有人吗？

尝试附加您的构建命令--网络=主机
Eg : docker build -t cointainer_name . --network=host

If you use the host network mode for a container, that container’s network stack is not isolated from the 
Docker host (the container shares the host’s networking namespace), and the container does not 
get its own IP-address allocated. 
For instance, if you run a container which binds to port 80 and you use host 
networking, the container’s application is available on port 80 on the host’s IP address.

Check here更多细节