When you install App Center's CLI by running the command
npm install -g appcenter-cli
and if you receive an error message:
npm ERR! If you are behind a proxy, please make sure that the npm ERR! 'proxy' config is set properly. See: 'npm help config'
This means that you are behind a proxy firewall. To successfully install App Center's CLI, you have to allowlist the DNS and configure npm to use a proxy.
For example,
npm config set proxy http://proxy.company.com:8080
npm config set https-proxy http://proxy.company.com:8080