LIST natpf rules in Virtualbox/Vagrant

Question

I often get errors like this when running Vagrant:

VBoxManage: error: A NAT rule of this name already exists
VBoxManage: error: Details: code NS_ERROR_INVALID_AR         


        

Answer 1

I came here with the same problem; with your hint about deleting the rule I found that you can use the VirtualBox GUI to find the rules and delete them.

Of course, this only works when you are working on a machine with a GUI desktop.

• Open the VirtualBox manager
• Open the settings for the box in question (rmb -> settings, or the gear icon)
• Select Network from the list on the left and open the Port Forwarding dialogue

From here you'll be able to directly remove the rules.

http://i.stack.imgur.com/6fQQc.png

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Looking at the rules, it seems they just get a name that is equal to the port being set. So you can also look at the Vagrantfile, and search for a line like this:

db.vm.network :forwarded_port, guest: 5432, host: 5432

And guess that the name of the rule will be 5432. The name of the rule for forwarding the ssh port 22, is called ssh

$ vboxmanage modifyvm "vbox-id" --natpf1 delete "5432"