HP Aruba VLAN help

I have some Xirrus APs that I can tag a VLAN on for a guest network. I have a port on my firewall that is set up for internet only. I'd like to tag ports on my HP Aruba switch to route traffic directly to that guest port on the firewall.

First off, is this the right approach?

Secondly, I can't get it working. Current Setup:

Aruba Port 1 <-> Xirrus AP
Aruba Port 2 <-> Xirrus AP

Aruba Port 47 <-> SonicWall guest port (X4)
Aruba Port 48 <-> Core Switch

SonicWall X0 <-> Core Switch

SonicWall X4 Config - IP: 192.168.100.1/255.255.255.0
VLAN2 Config - IP: 192.168.100.2, Default Gateway: 10.1.0.1, Subnet Mask: 255.255.255.0

​

It works without VLANS, but all traffic can see internal stuff. If I tag Port 1 and Port 47 with VLAN2, and then tag the SSID with VLAN2, there is no connectivity on the SSID. I don't have much experience with HP switches. I have it working on an old Cisco switch though. What am I missing here???