The Connect ID
The connect ID is used from PeopleTools 8+ and was implemented to replace the need for PeopleSoft to create users in the database.
The connect ID is a valid database user that is used during two-tier (database) signon. So it applies to tools such as application designer and data mover.
If you don't have a connect ID configured in configuration manager or you have the wrong connect password then you will get an invalid access ID and password for signon error EVEN if you use a valid PeopleSoft login (user name and password).
Use configuration manager to set the correct Connect ID in the Startup tab: