Internet recovery error result: -21 02D. What does it mean?

I was trying to do an Internet recovery due to the frequent freezing in my macbook.
Well, like I said, Internet recovery gave me this result after 30 second or so saying: apple.com/support -21 02D. So, what does it mean ?

It may be a router problem or  a problem was with the type of WiFi protection used.
About OS X Recovery, you must use the WPA or WPA2 on your WiFi for Internet Recovery.

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