Download the cacert. Pem </ code> file
http://download.csdn.net/download/u011534057/9847571
Create folder,C:\RailsInstaller
Save to
C:\RailsInstaller\cacert.pem.
Type in the command line CMD or Ruby prompt, and jekyll s will be fine

set SSL_CERT_FILE=C:\RailsInstaller\cacert.pem

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