Summary
Access Gateway error: Unable to authenticate (409-esp-[Access Gateway Device ID] ) processing step up authentication

Products
Access Manager (NAM)

Environment
Access Manager Version 5.0.3
Access Manager Access Gateway Version 5.0.3
Access Manager has been upgraded from Version 5.0.2 to Version 5.0.3
Protected Resources (PR) have been configured with a Contract (C) using a different Authentication Level
Example:
PR1 => C1 (Authentication Level = 1 / Satisfiable by a contract of equal or higher level = Enabled)
PR2 => C2 (Authentication Level = 2 / Satisfiable by a contract of equal or higher level = Enabled)

Situation
user runs a successful login to PR1
on the same user session user fails on login to PR2 with the error: Unable to authenticate. (409-esp-B2A28E64FD97EBC8)

Read Full Knowledge Base Article for Cause and Resolution. 

URL Name
KM000012670