Cocoapods on Mac unable to install “Could not find a valid gem 'cocoapods' (>= 0)”

Question

I have one office Mac running MacOS 10.13.2 and Ruby 2.2.1 and it is unable to install or run cocoapods via gems. sudo gem install cocoapods returns the error below. I compared the proxy and DNS configuration and it is identical to other macs that can install successfully.

▶ ping https://rubygems.org
ping: cannot resolve https://rubygems.org: Unknown host

What is causing cocoapods installation to fail with the cryptic no such name ( https://rubygems.org/specs.4.8.gz ) error message?

I tried the answer from this question: 'sudo gem install cocoapods' doesn't work on ElCapitan 10.11.4 , ERROR: Could not find a valid gem 'cocoapods' (>= 0) in any repository

$ sudo gem install cocoapods --source http://rubygems.org

ERROR: Could not find a valid gem 'cocoapods' (>= 0), here is why: Unable to download data from https://rubygems.org/ - no such name ( https://rubygems.org/specs.4.8.gz ) Unable to download data from http://rubygems.org/ - no such name ( http://rubygems.org/specs.4.8.gz )

Answer 1

通过连接到移动热点并通过它更新红宝石，解决了该问题。