OAuth redirect not working? Fix callback and session failures
OAuth failures often look like application bugs even when authentication succeeded. Trace the browser from login initiation through provider callback to the final application route and session establishment.
WHAT THIS USUALLY LOOKS LIKE
- Provider login succeeds but returns to login.
- Production says redirect URI mismatch.
- Callback route loads and then redirects incorrectly.
- Session exists briefly and disappears.
LIKELY FAILURE AREAS
Allowed redirect mismatch
The exact production callback origin/path may not be registered with the provider.
State/session handling
Cookies, PKCE/state data or server/client session logic can be lost across the redirect.
Wrong environment
Client IDs, site URLs or auth project configuration can differ between local, preview and production.
CHECK THESE FIRST
- Record the exact callback URL used in production.
- Compare it with the provider's registered redirect URLs.
- Inspect callback query/error parameters without publishing sensitive values.
- Verify the application establishes and retains a session after callback.
- Test production and preview origins separately.
WHAT WE NEED TO INVESTIGATE IT
- GitHub repository
- Deployed URL
- A test login path
- Provider/auth configuration access if required
Do not paste passwords, private API keys or other secrets into the public submission form. We request additional access only after scope review when it is actually required.
COMMON QUESTIONS
Why does OAuth work on localhost but not my domain?+
OAuth providers validate redirect origins/URLs. A localhost callback being allowed does not automatically allow the production domain.
Do you need my personal OAuth account?+
Usually not. A dedicated test path/account and narrow configuration access are preferable.
RELATED FIX GUIDES
STOP DEBUGGING
THE PROMPT LOOP.
VibeHell investigates the actual application, confirms scope and price, then implements and verifies the repair.