Claude Code authentication error: causes and fixes
Is there an outage right now?
Claude Code official status is operational. If this error persists, it is likely an implementation or environment issue on your side.
View Claude Code status →What this error means
Login/auth fails. Mainly expired tokens, bad API key, or auth-system issues.
Common causes
- •Expired login token
- •Wrong/expired API key
- •Temporary auth-system issue
- •Network/proxy interference
- •Config mismatch
How to fix
- 1.Re-login (/login) to refresh auth
- 2.Reissue and reconfigure the API key
- 3.Check network/proxy settings
- 4.Wait and retry
- 5.Check outage status at top of page
When waiting helps (and when it won't)
If the auth system is down, waiting helps. Usually re-login or re-keying resolves it.
Alternatives when Claude Code is down
Related symptoms
FAQ
What causes Claude Codeで認証エラー?
Login/auth fails. Mainly expired tokens, bad API key, or auth-system issues.
How do I fix Claude Codeで認証エラー?
Re-login (/login) to refresh auth / Reissue and reconfigure the API key / Check network/proxy settings / Wait and retry / Check outage status at top of page