The following deployment scenario caused this problem:
server-1: Java ES 2004Q2: Directory Server
server-2: Java ES 2004Q2: Application Server, Access Manager, and Portal Server
server-3: Java ES 2004Q2: Calendar Server and Messaging Server
server-4: Java ES 2005Q4: Application Server, Instant Messaging, and Access Manager SDK
When running the imconfig utility to configure Instant Messaging on server-4, the configuration was not successful. The Access Manager 7 2005Q4 SDK, which is used by Instant Messaging (IM) on server-4, is not compatible with the Java ES 2004Q2 release.
Workaround: Ideally, the Access Manager server and Access Manager SDK should be the same release. For more information, see the Sun Java Enterprise System 2005Q4 Upgrade Guide.