These ports are subject to change.
The list of ports that should be open in order to use MeetinVR are the following: 843, 4530, 4531, 4533, 5055 or 27001, 5056 or 27002, 5058 or 27000, 6060, 6061, 6063, 9090, 9091, 9093, 19090, 19091 and 19093.
For more information, you can check the description provided about the library we are using in the following link: Connecting to Photon Cloud