If you are connecting your server or desktop through putty and if you press Ctrl-S accidentally it will send Xoff the only way to recover is by pressing Ctrl-Q.
If you want to disable this use the folloing commands from your terminal
echo "stty -ixon" >> ~/.bash_profile
reset
For more options check stty man page from here
Thank to richard for this tip.
Fantastic!! I was breaking my head to get rid of this…
Finally found one working solution 🙂
Thanks a lot !!