Substitute Zidan Sutherland made the difference as Dover came from behind to beat Haringey and book their place in the next round of the FA Cup on Saturday.
Lower-division Haringey led at half-time after Khalifa Jabbie’s goal, only for striker Sutherland to bag a second-half brace to earn a 2-1 win and get them into the Fourth Qualifying Round.
The Isthmian Premier visitors, who had already knocked out division rivals Dulwich and National League South Tonbridge to reach this stage, settled well at Crabble.
Eight-goal Matthew Young sent a seventh-minute strike narrowly over. Whites created their first opportunity in the 19th minute in front of a crowd of 502 when on-loan AFC Wimbledon player Paris Lock fired a shot straight at Haringey goalkeeper Ted Collins.