Northampton Town are now third from bottom in League One after their second League One defeat in a row.
The Cobblers lost 1-0 to Wigan at Sixfields yesterday.
Meanwhile Peterborough United remain in 8th in the same division after a 1-1 draw with Doncaster at London Road.
Posh`s opponents snatched the equaliser in stoppage time.
Kettering are top of the Southern Premier.
The Poppies beat second placed Kings Lynn 1-0.
In the Southern League Division One South East AFC Rushden and Diamonds beat Bedford 1-0.
And in the Northern League Division One South Corby lost 1-0 to Bedworth.