561 Unauthorized

Unofficial · AWS

An AWS Application Load Balancer set to authenticate users got an error back from the identity provider.

Class
5xx Server Error. The server failed to fulfill a request that looked valid.
Registered
No. AWS sends it, and it is not in the IANA registry, so other servers may mean something else by it.
References
AWS ALB

Every 5xx code

All HTTP status codes, in one table