iOS 8 : Generating the Apple Push Notification SSL certificate on Mac Yosemite

According to the after link to going to generate Certs: (1)
http://www.raywenderlich.com/32960/apple-push-notification-services-in-ios-6-tutorial-part-1

After "Making the App ID and SSL Certificate" section, I have a Development SSL Certificate.

I get the error when use SSL certificate and private key to set up a secure connection:
x509 certificate routines:X509_check_private_key:key values mismatch:

After google and I can fix it by the following steps:

Import this Cert to Keychain with steps with this link:
http://stackoverflow.com/a/10477317
Step 1:Open your Keychain Access app.
Step 2:You will see list in left side as 'Login' ,'System' and 'System Roots', just drag your certificate in 'Login' option.
Step 3: You will get certificate install successfully in Keychain Access.

Generating the Apple Push Notification SSL certificate on Mac:
https://blog.serverdensity.com/how-to-build-an-apple-push-notification-provider-server-tutorial/
Follow from step 5 to generate SSL Cert, start by export cert and key file.

The steps from step 5 which the same with link at (1) in generate cert section.

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