The LDAP USER DN was changed on LDAP, but never updated in the TDM Repository.
Release : 4.7.113
Component : CA Test Data Manager - TDM Web Portal
Changed the USER_DN column in TDM Repository manually to reflect the correct USER DN that was in LDAP and it fixed the problem.
We have a patch for this if not wanting to update manually. Open a new support can and refer to Defect DE445710