The result keeps Lajong above East Bengal who now trail league leaders Bengaluru FC by 13 points with three games in hand.
Lajong made a bright start and hit the woodwork in the third minute as Uilliams Bomfin's long-range freekick was saved on to the post by East Bengal custodian Abhijit Mondal.
The red-and-gold brigade struggled to get going in the early stages as they were very wasteful in possession.
The Shillong side's next chance came after a Boithang Haokip freekick as Abhijit failed to collect the ball properly but no Lajong player could capitalise from the rebound.
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East Bengal were relying entirely on aerial balls and the long throws of Raju Gaikwad.
Their first real attempt for East Bengal came from a Raju throw as Edeh Chidi latched on to a loose ball but narrowly missed the target.
With the home side struggling to retain possession, Armando Colaco replaced young Subodh Kumar with Cavin Lobo in midfield but Lajong continued to be the better side but could not score because of their poor finishing and some fine goalkeeping from Abhijit.
Minutes before the interval, the 36-year-old custodian saved Redeem Talang's header from six yards after a brilliant cross from Uilliams.