1. DNS_PROBE_FINISHED_NXDOMAIN
    The domain name system cannot resolve the server IP address.

  2. 502 Bad Gateway
    The edge server received an invalid response from the upstream host.

  3. Connection Timed Out
    The origin server took too long to respond to the data request.

  4. Error 503 Service Unavailable
    The hosting server is temporarily overloaded or down for maintenance.

  5. SSL Handshake Failed
    The browser and the hosting server cannot establish a secure encryption link.