I get the error message "Could not find a valid gem 'bundler' <>= 0> in any repository" How can I fix this issue?

You are behind a firewall or virus software. You need to switch to use http://rubygems.org instead of https://rubygems.org. You can use the gem sources -r https://rubygems.org then -a http://rubygems.org it will remove the https and add just the http if you are having this issue you will have to change it in your Gemfile of your test app as well or your server won't run.

Ok on Windows 8.1 i had this problem. I've tried everything i found on the internet taking this as a starting point. In the end the best result (and simpliest one) is to change source adress to http instead of https by typing

gem sources -a http://rubygems.org

to command line. It will ask if you're sure to change adress just type y and you're done.

pff

Nikolay, I am having the same problem but am not behind a proxy, and don't seem to have any internet connection problems. I also checked my Windows Firewall in case that could be an issue.

Any other suggestions?

Thanks in advance!

Hi Nikolay, I had the same problem today.

Here is what I get when I type "gem install bundler"

ERROR: Could not find a valid gem 'bundler' ,.= 0>, here is why: unable to download data from https://rubygems.org/ - ssl_connect retur ned=1 errno=0 state=sslv3 read server certificate b: certificate verify failed ( https://rubygems.org/latest_specs.4.8.gz)

Any suggestion?

Best regards.