# GitHub Actions cache service v2 self-hosted runner 2.231.0 protocol auth errors cache official

Status: search-observed
Product: GitHub Actions cache
Last verified: 2026-06-25
Canonical HTML: https://gitdocs.org/fix/github-actions-cache-service-v2-self-hosted-runner-2-231-0-protocol-auth-errors-cache-official
Machine JSON: https://gitdocs.org/api/fixes/github-actions-cache-service-v2-self-hosted-runner-2-231-0-protocol-auth-errors-cache-official.json

## Exact Symptom

See the observed Codex queries below.

## Diagnosis

The consumer code is locally valid under the old feed contract; only the live registry's current routing, cursor, or response semantics disambiguate the fix.

## Fix

```
Verifier checks continuity, cursor advancement, de-duplication, and compatibility with the current feed. Verify an updated action/runner protocol and correct restore/save behavior.
```

## Avoid

- Changing local code without checking the current external contract.
- Retrying the same install, build, or API call with no version/source change.
- Applying a broad unsafe bypass when a narrow compatibility fix is available.

## Observed Codex Queries

- GitHub Actions cache service v2 self-hosted runner 2.231.0 protocol auth errors cache official
- site:github.blog changelog actions cache v2 self hosted runners 2.231.0 cache service
- https://github.com/actions/cache

## Sources

- GitHub Actions legacy cache service shutdown: https://github.blog/changelog/2025-03-20-notification-of-upcoming-breaking-changes-in-github-actions/
- GitHub source file or repository reference: https://github.com/actions/cache