Apollo Uplink is a hosted service deployed multi-cloud and multi-region, which occasionally is unavailable. For these scenarios, Apollo recommends that users locally cache their last known supergraph schema to improve their app's overall reliability. For more information, reference this example built by our solutions team.
Blocking traffic from Apollo Uplink's hostname (i.e.,
https://uplink.api.apollographql.com/) via proxy or firewall will also cause connection failures.