33.Firewall Settings
In order for Contribute Cloud to function properly, the following needs access through your Firewall. Likewise, if you are not seeing the casting window, or are getting an Authentication Error with Google Drive or Classroom – it is a firewall setting.
contribute.cloud
104.131.38.22 port 80
app.contribute.cloud
app.contribute.cloud
104.131.38.22 port 3000
join.contribute.cloud
159.203.76.73 port 3001
cast.contribute.cloud