@Fanxxx Do you have a load balancer in front of your NiFi Cluster? If so, the load balancer needs to be configured to use session persistence (also known as sticky sessions). That is because when you access node 1 for example and authenticate your user that token is only valid for that specific node (there is a client token and a matching server side key). If subsequent request/redirect is sent to a different node by the load balancer the node is going to be missing the matching server side key and reject the client token. Sharing more details about your NiFi security setup and Apache NiFi version is also valuable to those who may provide suggestion in the community. If you found any of the suggestions/solutions provided helped you with your issue, please take a moment to login and click "Accept as Solution" on one or more of them that helped. Thank you, Matt
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