Openfire 3.6.4 has a bug, which prevents user to login to Admin Console on the last step of the setup. You have to restart Openfire after the installation (stop and then start it again). Only then it will be possible to login to Admin Console. This bug should be fixed in 3.7.0 version.
I ran into this same issue and was not able to log back into the Admin Console.
The only way I was able to resolve it was to edit the openfire.xml file located in the /Openfire/conf directory. I changed the setup flag from ‘True’ to ‘False’ which kicked off the intial setup again upon launching the Admin Console.
I just kept the same exact settings as before, and even used the exact same Admin user from LDAP. Was able to login right after completing the quick setup as I had been doing previously.
I do not know what caused this to occur. I simply restarted the service and was unable to login.