pip install failed

[dogxxxxx]

I tried to install fairscale via proxy with the following code.

pip install fairscale --proxy host:port

It returns error logs:

Collecting fairscale
  Using cached fairscale-0.4.13.tar.gz (266 kB)
  Installing build dependencies ... error
  error: subprocess-exited-with-error

  × pip subprocess to install build dependencies did not run successfully.
  │ exit code: 1
  ╰─> [7 lines of output]
      WARNING: Retrying (Retry(total=4, connect=None, read=None, redirect=None, status=None)) after connection broken by 'NewConnectionError('<pip._vendor.urllib3.connection.HTTPSConnection object at 0x7f6871a10eb0>: Failed to establish a new connection: [Errno 101] Network is unreachable')': /simple/setuptools/
      WARNING: Retrying (Retry(total=3, connect=None, read=None, redirect=None, status=None)) after connection broken by 'NewConnectionError('<pip._vendor.urllib3.connection.HTTPSConnection object at 0x7f68719b7070>: Failed to establish a new connection: [Errno 101] Network is unreachable')': /simple/setuptools/
      WARNING: Retrying (Retry(total=2, connect=None, read=None, redirect=None, status=None)) after connection broken by 'NewConnectionError('<pip._vendor.urllib3.connection.HTTPSConnection object at 0x7f68719b7430>: Failed to establish a new connection: [Errno 101] Network is unreachable')': /simple/setuptools/
      WARNING: Retrying (Retry(total=1, connect=None, read=None, redirect=None, status=None)) after connection broken by 'NewConnectionError('<pip._vendor.urllib3.connection.HTTPSConnection object at 0x7f68719b75e0>: Failed to establish a new connection: [Errno 101] Network is unreachable')': /simple/setuptools/
      WARNING: Retrying (Retry(total=0, connect=None, read=None, redirect=None, status=None)) after connection broken by 'NewConnectionError('<pip._vendor.urllib3.connection.HTTPSConnection object at 0x7f68719b7790>: Failed to establish a new connection: [Errno 101] Network is unreachable')': /simple/setuptools/
      ERROR: Could not find a version that satisfies the requirement setuptools>=40.6.2 (from versions: none)
      ERROR: No matching distribution found for setuptools>=40.6.2
      [end of output]

  note: This error originates from a subprocess, and is likely not a problem with pip.
error: subprocess-exited-with-error

× pip subprocess to install build dependencies did not run successfully.
│ exit code: 1
╰─> See above for output.

note: This error originates from a subprocess, and is likely not a problem with pip.

I've also tried --no-cache-dir and --no-build-isolation but neither worked.
It seems that the package had been downloaded but couldn't be installed. Thus, it may not be the problem of proxy.
Below is my environment.

Python = 3.9.12

Package            Version
------------------ ----------
certifi            2022.12.7
charset-normalizer 2.1.1
filelock           3.9.0
idna               3.4
Jinja2             3.1.2
MarkupSafe         2.1.2
mpmath             1.2.1
networkx           3.0
numpy              1.24.1
Pillow             9.3.0
pip                23.2.1
requests           2.28.1
setuptools         58.1.0
sympy              1.11.1
torch              2.0.1+cpu
torchaudio         2.0.2+cpu
torchvision        0.15.2+cpu
typing_extensions  4.4.0
urllib3            1.26.13
wheel              0.41.1