Claude Login Errors: When Signing Out Can Backfire
Signing out and back in sounds like a harmless fix—until the part that signs you back in is the part that is broken. During Claude’s September 29, 2026 incident, Anthropic reported that existing conversations were mostly working again while many users still could not sign in. Its advice to people who were already connected was to stay signed in. That incident is resolved. This is a closer look at the official incident record , and a way to decide what to do when an authentication error appears again. The first useful question is not “Have I restarted everything?” It is “Do I still have a session that works?” The service did not recover all at once The update posted at 15:00 UTC described a mitigation at 14:36 UTC: existing conversations were mostly working, but sign-in and several other actions remained affected. The final report put the overall impact window at 14:00–14:59 UTC. Those are different kinds of times: when an update was published, when a mitigation happened, and when ...