The Internal Revenue Services requires private foundations filing the Form 990PF to also file a copy with the Attorney General's Office in the state the foundation is located in.
If the foundation is located in Connecticut, the foundation must send a copy of Form 990PF to: Connecticut Attorney General's Office, Special Litigation – Charities Unit, 165 Capitol Ave, Hartford, CT 06106).
This is an IRS rule that is not part of the Connecticut Solicitation Act. If the foundation solicits funds or charitable contributions, or if it is a privately-funded foundation and solicits funds from the public, it should be registered with DCP and also send a copy of the Form 990PF to the Attorney General's office per IRS instructions. If it is strictly privately-funded it only needs to file with the Attorney General's Office.