Independent experts say that should put total enrollment in the new private insurance plans offered on both federal and state-run markets at about 2 million people through the end of the year.

That would be about two-thirds of the administration’s original goal of signing up 3.3 million by Dec. 31, and would represent a significant improvement given the technical problems that crippled the federal market during much of the fall. The overall goal remains to enroll 7 million people by March 31.