$ gem list knife-ec2
*** LOCAL GEMS ***
knife-ec2 (0.6.4)
$ knife ec2 server list
ERROR: Excon::Errors::SocketError: Unable to verify certificate, please set `Excon.defaults[:ssl_ca_path] = path_to_certs`, `Excon.defaults[:ssl_ca_file] = path_to_file`, or `Excon.defaults[:ssl_verify_peer] = false` (less secure).
$ gem update excon
Updating installed gems
Updating excon
Fetching: excon-0.25.3.gem (100%)
Successfully installed excon-0.25.3
Done installing documentation for excon (0 sec).
Gems updated: excon
$ knife ec2 server list
Instance ID Name Public IP Private IP Flavor Image SSH Key Security Groups State
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