I installed ArcIMS Administrator I can't log in. It used to immediately prompt me for a new password, now it doesn't. It just asks for an existing password.
The shortcut to ArcIMS Administrator installed by ArcIMS explicitly hardcodes the path to javaw.exe. Since ArcIMS changed the version of JRE that it requires, the path to javaw.exe changed. So if you copied the ArcIMS Administrator shortcut from a previous installation to your desktop, then when you click it, the old version of javaw will be run, which will result in ArcIMS Administrator coming up as usual, but you not being able to log in.