Over the past 12 years I have always tested merchants by checking links and test purchases. The other day I had a merchant tell me that my links were correct but the cookie wasn't getting set. I asked how he knew and he told me he had a program. He then sent me a trace of my link. Showed me how it left my site, redirected to the affiliate program site, redirected to his site. it showed the encoding and decoding and then confirmed if a cookie was set. Pretty cool!

He won't answer the question. Anyone know if this is an off the shelf program or one they created?