Other than the general Java proxy settings (Which I have it setup to use the proxy), is there any way to set/use a proxy to actually connect/play?

Setting the proxy settings in Java allowed me to grab all the files and install the game just fine, but I'm unable to log in:

"Either there is a temporary network outage or the server is not yet fully operational. Please wait a moment before reconnecting."

Is there a workaround?

Currently running Squid3 as a proxy. Not sure if there are specific ports, etc, being utilized that I need to open?

Edit:

I can see the client hitting the proxy for an HTTP get request during application start:
1302135313.706 239 127.0.0.1 TCP_MISS/200 3739 GET http://download.threerings.net/spiral/client/getdown.txt - DIRECT/66.114.53.44 text/plain

But actual login doesn't seem to be making a request. Again, assuming a port needs to be setup for actual login/play.

Edit 2:

Found a mention of a port to forward (firewall) and set that as a safe port in Squid:
acl Safe_ports port 47624 # Spiral Knights

No luck. Still can't login.