When a datasource connection fails for a datasource which is set as the session/client storage, and the application has "sessionCluster=true" defined, then the following incorrect error message is thrown by Lucee:

datasource [DSNName] is not enabled to be used as session/client storage, you have to enable it in the Lucee administrator or define key "storage=true" for datasources defined in the application event handler.

The mesage should instead be something along the line of "datasource [DSNName] could not be reached for session/client storage. Please make sure the datasource settings are correct, and the datasource is available."