Dundalk have dropped two more points in their pursuit of leaders Cork City in the SSE Airtricity Premier Division.
The 3-in-a-row champions were held to a scoreless draw by Derry City at Oriel Park.
Dundalk are now 15-points adrift of Cork at the top of the table.
Third placed Bray were also held to a scoreless draw by a Drogheda side that move off the bottom to eighth with that point.
While a late Dano Byrne own goal saw Limerick pick up a 2-1 win at Bohemians.
Bohs ended the game with ten men following the injury time dismissal of Dylan Hayes.