Hayes & Yeading were thrashed 4-0 at Newport on a miserable night for Nas Bashir’s men.
Scott Rogers’ early opener put the home side ahead, and three goals in 13 second-half minutes left United shell-shocked.
Elliott Buchanan latched onto Felino Jardim’s through-ball to double Newport’s lead before two goals from Danny Rose completed the rout.
United gave a debut to new signing Harrison Bayley, who came on as a 70th-minute substitute.
There was also a defeat for Hampton & Richmond, who went down 2-1 at Woking.