For those of you interested: If you upgrade your ISC/AC, it is important to remember the username/password with which the ISC/AC was installed with. If you forget your username/password combo [usually (iscadmin/iscpass)], you could have potential problems of not successfully being to upgrade.
If by some chance you change your password combination, there is a proper way to do this: [IC55394: FULL STEPS FOR CHANGING THE ISC INSTALLATION ID PASSWORD ARE NOTCLEAR AND CAN CAUSE ISC/ADMIN CENTER UPGRADE FAILURES] http://www-01.ibm.com/support/docview.wss?uid=swg1IC55394 In the end my upgrade from AC 5.4.0.0 (ISC already at 6.0.1.1) was unsuccessful. The end solution was to uninstall the ISC and perform a fresh install of the ISC and the AC. In case you wanted to know.
