Scenario ; Migration from Exch 5.5 site by adding Exch 2k3 server to the site, to move mailboxes, etc and decomm the Exch 5.5 server.
An existing ADC server is in place and the CA's are setup.
When running the Exch 2k3 install, an error occurs when the ADC ConfigCA is being created. Logs show something like " LDAP failed, Invalid Credentials...."
Went through a range of attempted resolutions, from adding a new 5.5 server to point to in the site, fresh install of W2k3 server,...
Considered creating another ADC server to use for the remainder of the migration phase.
Before this last consideration, re-entered the username & password to be used for each of the CA's on the ADC. Attempted the install of Exch 2k3 again and completed successfully !
Conclusion is that when entering the credentials to be used for the CA's, there is no validation that the credentials are in fact valid credentials. Suggestion is to either validate the credentials before the CA is instituted, or, modify the error details in the 'active directory connector setup.log' to indicate that the 'Invalid Credentials' can be corrected by verifying correct username &/or password used for the CA's is correct.
Good Luck & Regards
Peter W