Issues accessing ServiceDesk Plus from outside the network

Issues accessing ServiceDesk Plus from outside the network

I apologize in advance for my ignorance.

I have ServiceDesk Plus running on a Win7 VM.  I can get to it from inside the network at any time, but I'm having intermittent issues accessing it from outside the network.  I can ping the assigned ip, but the login page never loads.  We've recently locked down the network a little and have been shutting off some services and closing some ports.

What services does SD need to run?  What ports does it use?

                  New to ADSelfService Plus?