OK, thanks everybody, there is no bug.
My VPS provider has a special DDOS filter, for a test I asked them to turn off, and tadaam !
So they made an exception for my VPS IP, filter must be turned off for eternity.
However there were some strange thing, I do not understand why it worked after downgraded CHR, and how it worked from my laptop and not worked from main router, and worked from a router behind my NAT, but I think all of them caused the DDOS filter rules which is now off.
I also updated my oracle virtual box to the latest, now everything works in my test environment too.