What is "Maintenance Mode" and how do I enter it? I am having problems loading ISA in Enterprise Mode. It looks like there are remnants of failed load left in AD, and I am unable to remove them. If I try a "-r" (reinstall) switch I get an error saying that a command line option that can only be used in maintenance mode is being specified and it errors out with #688. The same thing happened when I tried uninstalling from the Control Panel. I've even taken the computer out of the domain, formatted, reloaded 2k, joined the domain and tried reloading.... same error. If I try running MSISAENT.EXE to remove the schema objects it says that one or more arrays in the enterprise still have members and that I need to uninstall ISA from the array members before proceeding.