9. I set my RWIN to N, but the Analyzer shows something slightly different. What gives?

While you can enter any RWIN value in the registry, the TCP stack will only accept some values. The value you see on the page is the best compromise between what you entered and what the stack is willing to accept. TCP headers only contain an unscaled RWIN value lower than 65536 and a scale, or rather shift factor used for larger RWINs. Valid RWIN values must be divisible by 2^shift factor. That can create slight differences however the value that the analyzer reads is what every other server on the net will get as well.