what is the best way to crack s/w that acccess the web to check s/n?

[JMI]

There are generally (at least) two issues which may be important when considering software that connects to the author's website to confirm its validation.

First, if it is just a "confirmation" of a S/N, followed by a goodboy/bad cracker switch, you can often just "redirect" the URL it calls home to and activate the goodboy selection.

However, if it calls home and confirms your registration info before it sends you something (i.e., decrypt code) you need to make some vital part of the program actually work, you have a much more difficult problem.

Regards,