Problem with clientlog, info, cpu, disk, memory

Hi to all!

I've just installet xymon server (on Centos 7), but I've 2 problems:

1) All my linux machines (xymon server included) ha the clientlog column
(with all the client's info), but no cpu, disk or memory column.

2) The info column af any objecy (linux machines, windows machines, other
objects) if selected, gives a "No such host" blank page.

Any ideas?

Thanks!
Luca