What port do I need to open for incoming and outgoing traffic?

You need to open port 80 to both incoming and outgoing traffic. SOCKET and HTTP type connections are used to communicate with our Cloud Servers. If you need explicit rules be sure to add:
galaxy.signage.me = 54.200.115.211
pluto.signage.me = 54.213.160.52
moon.signage.me = 54.213.145.191
earth.signage.me = 54.213.120.251
sun.signage.me = 54.200.76.248
eris.signage.me= 54.213.141.167
neptune.signage.me = 54.201.214.88
jupiter.signage.me = 54.200.82.139
Ida.signage.me = 54.200.232.81
84.109.103.198
84.109.0.182
54.213.5.133
54.213.47.132
54.213.45.90
54.213.3.30
54.213.160.84
54.213.160.58
54.213.159.84
54.213.152.120
54.213.130.252
54.213.120.28
54.213.120.51
54.200.84.221
54.200.235.59
54.200.133.40
54.200.109.147
172.31.47.220
172.31.44.127
172.31.42.127
172.31.41.111
172.31.40.54
172.31.40.254
172.31.40.233
172.31.39.200
172.31.37.99
172.31.37.87
172.31.37.86
172.31.37.117
172.31.36.79
172.31.35.3

But note that servers are sometimes added so *.signage.me will allow for greater flexibility

To view a video tutorial click here.