尝试访问 “https://mirrors.tuna.tsinghua.edu.cn/anaconda/archive/” 查看是否被禁了。

「上海交通大学」 镜像源 | 配置 C:\Users\lee\.condarc | 可在 conda info 中查看配置位置

channels:
  - defaults
show_channel_urls: true
channel_alias: https://anaconda.mirrors.sjtug.sjtu.edu.cn/
default_channels:
  - https://anaconda.mirrors.sjtug.sjtu.edu.cn/pkgs/main
  - https://anaconda.mirrors.sjtug.sjtu.edu.cn/pkgs/free
  - https://anaconda.mirrors.sjtug.sjtu.edu.cn/pkgs/mro
  - https://anaconda.mirrors.sjtug.sjtu.edu.cn/pkgs/msys2
  - https://anaconda.mirrors.sjtug.sjtu.edu.cn/pkgs/pro
  - https://anaconda.mirrors.sjtug.sjtu.edu.cn/pkgs/r
custom_channels:
  conda-forge: https://anaconda.mirrors.sjtug.sjtu.edu.cn/conda-forge
  soumith: https://anaconda.mirrors.sjtug.sjtu.edu.cn/cloud/soumith
  bioconda: https://anaconda.mirrors.sjtug.sjtu.edu.cn/cloud/bioconda
  menpo: https://anaconda.mirrors.sjtug.sjtu.edu.cn/cloud/menpo
  viscid-hub: https://anaconda.mirrors.sjtug.sjtu.edu.cn/cloud/viscid-hub
  atztogo: https://anaconda.mirrors.sjtug.sjtu.edu.cn/cloud/atztogo