I just now saw that you sent another question with the links. I’m attaching it here:
By mistake, the links to the critical articles weren’t included. I’m attaching them here –
http://www.kipa.co.il/Ask the Rabbi/Certainty and Truth/

http://www.angelfire.com/va3/amielectroni_2003/site/archive/choveret_kenes/fish.htm

In the first one there is no criticism at all that can be responded to.
The second is nonsense. There is no such thing as “beyond reason.” Those are just empty words. And his objections about identifying skepticism with postmodernism are not objections. Indeed, it is almost identical, and the fact that the postmodernists think they are something new does not mean they are right. Second, there is something different in the tune, because the skeptics were left with a question mark, while the postmodernists put an exclamation point at the end. They supposedly define the concept of truth differently (but in fact there is nothing behind this except the negative claim).
See my lecture on this here:

Thanks. And regarding Rabbi Kalner’s book? What does the rabbi think?

I haven’t read it.