alright my son plays black ops 3 on his laptop at his mom place and he keeps getting this message , black ops 1 is alright so is any other games ( wow , hearthstone , roblox studio , etc etc ) he checked and the nat Is open so its not that any ideas around ?

Single player?
Multiplayer?

Could be the black ops 3 server having issues.
Could be the person he's trying to connect to having issues.

If nat is open, all I can say is wait until it fixes itself, power cycle the modem + router, flush his dns (google), make sure his firewall is allowing black ops 3 (google: allow program through firewall), try to connect to a different host if the option is available (different server? usa/eu).

Does it work at your house? Log into your son's account, download it, and try to play what he is having problems with.

happens to both single and multiplayer , its working at my house

did you really say single player? Fucking moron. how do you lose connection to host in single player

thank you very much for your constructive comment

he did put up a ticket and talked to an ambassador which he said there is a problem somewhere and he escalated the ticket

long time no see mate

I'm always around just hiding in the wow section , this section is new to me hehe

nice to see you around

tried verifying files on steam and making sure firewall/av is not blocking?

This.
Make sure the files are verified