Hi there, i'm a new user of linux. i have installed virtual box on my linux machine. Now i want to set an SSH connection between both of the Machines. when i try to connect my system with virtual box machine with SSH, it does not connect and the following error comes always.
ssh: connect to host ####### port 22: Connection timed out.
Any one here to help me?

Hi and WELCOME to LQ! I faced the same problem. One easy solution is to add a 2nd *bridged* network.
here (1st, poweroff guest; in Network, Adapter 2, Enable as bridged; default Name ok)
or this

Best wishes! Enjoy... (when you mark this "Solved", post exactly how, to help others!)

p.s.
Also, (esp. if you had included virtualbox in your title, and maybe host to guest)
check the "Similar Threads" at the *bottom* of (all!) posts here.

There's also the "Newbie" forum. (maybe include details like 'distro')

web-searches returned lots of other ways (many obscure/confusing),
so picking the 'right' keywords is the 'secret/trick/key'

can you ping virtual machine.

put this on virtual machine

#allow ssh
iptables -A INPUT -i enp2s0 -p tcp -s 192.168.0.12 --dport 22 -m state --state NEW,ESTABLISHED -j ACCEPT
iptables -A OUTPUT -o enp2s0 -p tcp --sport 22 -m state --state ESTABLISHED -j ACCEPT

-s - change this to your ip from which you connecting
and change enp2s0 to your virtual machine adapter

ifconfig or ip addr to see network adapters on linux

The default settings of virtualbox include using NAT. This will not allow you to do what you're trying to do. You need to change the network adapter type to Bridged while the VM is powered off, so that the VM can get an ip address from your router. You should then be able to ssh in, as long as sshd is running on the guest. Beware that some default configurations disallow root logins.