I have this exact problem! I installed the latest mIRC on my new computer. I only get "unable to resolve server".
However, I was able to copy my old hard drive files into a separate folder on my new computer's hard drive. And the old mIRC (6.03, I think, from a couple of years ago maybe) is there. When I click on that icon, I get to the afterx server just fine. What gives?! Much thanksz.