#
Port Forwarding in VirtualBox
This guide is only necessary if...
- your server is running on a virtual machine, and
- the network adapter is attached to NAT (the default setting)
Any time you need to connect to your virtual machine remotely (whether by SSH, HTTP, or another protocol), you'll need to make sure the appropriate port is forwarded from your host machine.
The steps below focus on SSH and port 22, but you can use this guide for any service and port.
Open Oracle VM VirtualBox Manager on the host machine.
Click to select the virtual machine from the list on the left.
Click the Settings button.
Click Network from the pane on the left.
Under the Adapter 1 tab, click Advanced.
Click Port Forwarding.
Click the Adds new port forwarding rule. button 
. It's on the
right side.
In the table on the left, double-click Rule 1. This will allow you to edit the name of the rule. Type in the name of the service. For example, SSH.
Under Host Port, enter the port number you want the host machine to listen on. This can be anything, but for simplicity, I recommend using the same as the guest port. For SSH, use port 22.
If you have multiple virtual machines which you will be SSHing into, or you already have an SSH server running on the host machine itself, you may want to enter a different Host Port. In that case, choose any number you like between 1024 and 49152. Just make sure it is not in use by any other service.
Under Guest Port, enter the port number that your virtual machine is listening on. For SSH, use port 22.
Leave everything else blank.
Click OK.
Click OK again.
#
Other Ports
In this series of documentation, we will be setting up services that listen on the following ports. You should add a new rule to set up port forwarding for each of them.
With the ports properly forwarded, you can start setting up remote connections to the server.