Mac OSX VirtualBox Ubuntu pgAdmin3 firewall issues

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http://askubuntu.com – I have a Win7 machine hosting an Ubuntu 13.04 virtual machine through VirtualBox. I have PostgreSQL 9.2 installed on Ubuntu and everything seems to be up and running properly. Here's the problem... I have a MacBook Pro OSX 10.8.4 with pgAdmin3 and I'm trying to connect to PostgreSQL on the Ubuntu VM. If I disable the Ubuntu firewall (sudo ufw disable) then I am able to successfully connect from my MacBook's pgAdmin3. However, once I flip the Ubuntu firewall back on (sudo ufw enable), I am no longer able to connect from my MacBook. PostgreSQL is listening on port 5432, and I've tried adding a (HowTos)