You need to log on to your router via its web interface, and check that:
1. The Kindle is appearing on the list of devices for the DHCP server (assuming your router is a DHCP server - they almost all are).
2. That it's not being blocked. Pretty much all routers give you the option of only allowing specified devices to connect - you might have enabled this.
How you do this depends on your router - they're all different.
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