After the report came in just before 1 p.m., the university urged students and staff to stay inside, and several police officers responded to the West Haven school.
The university lifted the lockdown around 5:30 p.m. after police searched the main campus. Restrictions on the north and south campuses had been lifted earlier after searches there. Evening classes were canceled.
The report of an armed man marked the third scare at a Connecticut university in the last several weeks.