Barak Perelman is CEO of Indegy, an industrial cyber-security firm that improves operational safety and reliability for industrial control networks by providing situational awareness and real-time security.
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initial handshake between client and server, and what to do to minimize their ability to infiltrate." - G.
See the literature which came with your router for how to access its user setup screens.
If this is blocking your access to the router setup screens, you may need to press the router's reset button (usually behind a pinhole next to the ethernet sockets).