rubygems.org: Vodafone Secure net is blocking https://rubygems.org

Describe the problem as clearly as you can

Try either one of:

• Try to install gem
• Browse https://rubygems.org through Chrome 113.0.5672.126
• Browse https://rubygems.org through Safari

Did you try upgrading RubyGems?

Does not seem to be related to version of rubygems but the hosting of rubygems.

Steps to reproduce the problem

Try to build the following dockerfile:

FROM ruby:${VARIANT:-3.2-buster}
RUN apt-get update \
    && apt-get install -y apt-transport-https ca-certificates\
    ruby

RUN gem install bundler

Which command did you run?

• gem install bundler
• navigate through browser

What were you expecting to happen?

• For bundler to be installed
• For rubygems to be displayed

What actually happened?

Error related to certificates:

#0 0.362 ERROR:  SSL verification error at depth 0: self signed certificate (18)                                                                          
#0 0.362 ERROR:  Certificate /C=US/ST=USA/L=New York/O=Optimization/OU=Optimization/CN=tomcat is not trusted                                              
#0 0.412 ERROR:  SSL verification error at depth 0: self signed certificate (18)
#0 0.412 ERROR:  Certificate /C=US/ST=USA/L=New York/O=Optimization/OU=Optimization/CN=tomcat is not trusted
#0 0.467 ERROR:  SSL verification error at depth 0: self signed certificate (18)
#0 0.467 ERROR:  Certificate /C=US/ST=USA/L=New York/O=Optimization/OU=Optimization/CN=tomcat is not trusted
#0 0.469 ERROR:  Could not find a valid gem 'bundler' (>= 0), here is why:
#0 0.469           Unable to download data from https://rubygems.org/ - SSL_connect returned=1 errno=0 peeraddr=62.74.130.28:443 state=error: certificate verify failed (self signed certificate) (https://rubygems.org/specs.4.8.gz)
#0 0.531 ERROR:  SSL verification error at depth 0: self signed certificate (18)
#0 0.531 ERROR:  Certificate /C=US/ST=USA/L=New York/O=Optimization/OU=Optimization/CN=tomcat is not trusted
#0 0.589 ERROR:  SSL verification error at depth 0: self signed certificate (18)
#0 0.589 ERROR:  Certificate /C=US/ST=USA/L=New York/O=Optimization/OU=Optimization/CN=tomcat is not trusted
------

Run gem env and paste the output below

Note the Dockerfile above.