just found out there is a 9.1 version of the pulse client (from may) and in the release note:
=> PRS-369889 Summary: Authentication with Host Checker verification fails on Kernel 4.18.0
and indeed, it seems ok when I tested it.
I have just downloaded and installed the 9.0R4(943), and it does not work on 4.18 yet!
Where can we download the 9.1?
I would inform everybody that I have received the 9.1R3 from my company network department, and it works like a charm on kernel 5.0.0 too!!!