I want to share a method that worked for me after many problems. The issue was that I could not access the folder with the file (actually, I could not access any folder in the domain).
When this problem happened, a warning that it might have something to do with the firewall appeared. So I turned off the firewall and everything worked... but when you turn the firewall ON again it stops working.
In this case you need to delete the rules (All of them except the one with the panel PORT of course!!)
I can not confirm if it's necessary to regenerate them by hand (that's what I did), or you can export them and import them (which is much easier). But after that, I could access the SLL file and now everything is working!