Why do trace routes and pings to s3.amazonaws.com fail?
The Amazon network blocks the packet types (ICMP) used by trace route utilities (so destination unreachable is expected behavior). Providing the results of a trace route are still useful when troubleshooting network related issues. Speaking generally, the route between any end-user endpoint and the Amazon network normally traverses many routers, most of which are not controlled by either Amazon or end users. Providing the results of a trace helps to determine if a user is experiencing issues related to one of these many routers.