Can not able to install PyInstaller on cloud machine (Persistance VDI) - pip

Question

I am trying to install pyinstaller on my windows (windows 10) machine, I have VDI on cloud, I have installed Anaconda Navigator and inside that installed Python Version 3.6.3.
But when I tried to install the pyinstaller library using Anaconda Prompt and CMD, it is throwing some error regarding "NewConnectionError" and "No matching distribution found for pyinstaller".
I have also tried with .whl file.
pip install <whl-filename>
One of the solution mentioned using Proxy IP (server) able to install, but that solution also won't work.
I have searched on google and tried to find some solution but did not get success, also I've tried with specific version of pyinstaller.
You can see below error report.
pip install pyinstaller
Collecting pyinstaller
Retrying (Retry(total=4, connect=None, read=None, redirect=None, status=None)) after connection broken by 'NewConnectionError('<urllib3.connection.VerifiedHTTPSConnection object at 0x0000025F6522D860>: Failed to establish a new connection: [Errno 11001] getaddrinfo failed',)': /simple/pyinstaller/
Retrying (Retry(total=3, connect=None, read=None, redirect=None, status=None)) after connection broken by 'NewConnectionError('<urllib3.connection.VerifiedHTTPSConnection object at 0x0000025F6522D5F8>: Failed to establish a new connection: [Errno 11001] getaddrinfo failed',)': /simple/pyinstaller/
Retrying (Retry(total=2, connect=None, read=None, redirect=None, status=None)) after connection broken by 'NewConnectionError('<urllib3.connection.VerifiedHTTPSConnection object at 0x0000025F6522D7B8>: Failed to establish a new connection: [Errno 11001] getaddrinfo failed',)': /simple/pyinstaller/
Retrying (Retry(total=1, connect=None, read=None, redirect=None, status=None)) after connection broken by 'NewConnectionError('<urllib3.connection.VerifiedHTTPSConnection object at 0x0000025F6522D828>: Failed to establish a new connection: [Errno 11001] getaddrinfo failed',)': /simple/pyinstaller/
Retrying (Retry(total=0, connect=None, read=None, redirect=None, status=None)) after connection broken by 'NewConnectionError('<urllib3.connection.VerifiedHTTPSConnection object at 0x0000025F6522D470>: Failed to establish a new connection: [Errno 11001] getaddrinfo failed',)': /simple/pyinstaller/
Could not find a version that satisfies the requirement pyinstaller (from versions: )
No matching distribution found for pyinstaller
pyinstaller install failed:
keyring install failed:
I thought there is some restriction for package site, but I can able to open "https://pypi.org/project/pyinstaller/" site in browser as well, no any restriction I found.
Same issue while fetching the keyring library.
Extra:
VDI = "Virtual desktop infrastructure" is a technology that refers to the use of virtual machines to provide and manage virtual desktops.
While VDI allows access to a remote desktop on which users can work, VPN establishes a tunnel between the end-user and an organization's private network.