That means the IRS will not be accepting electronically filed federal tax returns during that period. It also means that the Rhode Island Division of Taxation will not be accepting e-filed Rhode Island returns during that period because the federal/state e-file program will be unavailable.
The joint fed-state e-file program is a cooperative tax-filing effort between the IRS and most states, including Rhode Island. In general, it allows for federal and state returns to be e-filed simultaneously to the IRS. Once the returns are filed, the IRS keeps the federal portion; the state portion is passed along electronically to the applicable state.