Some districts have firewalls or web filters in place that only allow outbound connections to certain domains. If your network uses systems like these, you will need to add Clever's domains to the whitelist so that your district will be able to successfully use Clever.
The list of domains your district should whitelist for Clever are:
accounts.google.com(if your district uses Clever Badges)
The exact syntax to use will depend on your network.
If you have any questions, please reach out to Clever support! We are happy to help!