Scenario : Exchange 5.5 migration to Exchange 2003. Adding Exch 2K3 server into pure Exch 5.5 site readying for mailbox migration. An ADC server in place, 2003 AD in place.
When installing Exch 2K3 on new server in site, fails to install at the point of setting up the ConfigCA, reading the log, 'ADC setup.log', error is given as LDAp credentials invalid. But where ? After attempting resolutions ;
1. New Exch 5.5 server in site to point to
2. Rebuild fresh install of W2K3 server
3. Additional ADC server
Discovered that the credentials used on the ADC machine, for that particular site were invalid, ( typo error ). Suggest that the error message advise to recheck credentials to be used, or in the setup of ADC, validation of account name/password to be used.