deployment_selection_failed - Unkey Docs

err:frontline:platform:deployment_selection_failed

This code is reserved, and the gateway doesn’t return it. When there’s no instance to serve a request, you get err:frontline:capacity:no_running_instances. Other failures inside the gateway show up as err:frontline:platform:internal_server_error.

How to fix

There’s nothing to fix. If a request didn’t reach an instance, start from the two errors below.

err:frontline:capacity:no_running_instances: what the gateway returns when there’s no instance to send the request to.
err:frontline:platform:internal_server_error: the general gateway failure.

Last modified on October 6, 2026

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