Thanks Rommel, I had read that post. I was hoping that it was 80 or 443 or somthing more common. I am surprised if it is this port and they did not make it clearer in the documentation.
When setting up a multi master SSO environment on regonially dispursed vCenters, you would have to make sure that these ports are open to make sure that the SSO instances are syncing. I would think that if this is the case, it would be more pronounced in the documentation.