There are some things to check.
1) using a dyndns name will almost certainly not work from within the network containing your server (the 192.168 one). It is very rare for a home router to support loopback routing. Is your kindle connected to a network outside of your home network?
2) you might have a dynamic IP address from your ISP. Did you set up your router to inform dyndns if the external IP address changes?
3) Do kindles support DNS time-to-live limits? If not, then it could be using an old IP address. Reboot your kindle and try again.
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