Harlow Town 3 Harrow Borough 0
Borough will go back to the drawing board and figure out where it all went wrong on Tuesday night.
David Howell's men looked handy in the first half before a they were sunk by second half goals from Mark Taylor (2) and Jamie Reynolds.
They will get a welcome respite this weekend because of their early FA Cup exit and Howell is keen to make good use of the four training sessions they have before their next game against Boreham Wood at Earlsmead on October 4.
"It is a welcome break for us as it allows injured players to return and for me to work on things with the squad," said the manager. "Between now and the next game I am going to work on the pattern of our play and our shape.
"We still need to improve in the final third and Darren Grieves will be back after having the stitches taken out from the nasty head would he received against Hemel Hempstead in the FA Cup.
"Darren gives us that foil where others can play off him."
However, Howell's lengthy preparations have been hit with the news goalkeeper Andray Baptiste could be out with a knee problem. Gary Ross took his place on Tuesday night for his first start of the season and could continue to deputise until Baptiste recovers.
As for Tuesday's result, Howell reckons complacency may have crept in at the interval.
"We played well in the first half and created good chances but failed to take them. We had the lion's share of the game and I thought we were going in the right direction, but we stayed in the changing rooms for the second half - we just didn't show up."
A needless challenge by Danny Leech allowed Taylor to fire Harlow ahead from the penalty spot before the other two goals came from free-kicks, ruthlessly exposing Harrow's weaknesses at set-pieces.
"When we've been a goal down at half time in previous games we've come out for the second half with purpose.
"This time we came in level and you would say it was a slight improvement, however I think we were a bit complacent and the players thought it would automatically happen for us."
Meanwhile, Howell has increased his attacking options with the acquisition of Warren Whitely.
The 24-year-old can play on either flank and Howell believes he has a talent on his hands.
"He's got something about him," added the Borough boss. "He has got pace, is very skillful and can go right and left. Five minutes after he came on he had three chances and gave us that injection we needed."
Harrow Borough: Ross, L Hall, Watts, Walters, Leech, Highton (Morlese, 70), Lawrence, Frempong (Clarke, 74), McGonigle, Constant, Shroot (Whitely, 60).