Lee Bell’s 100th match in charge of Crewe ended in a 2-1 defeat at Newport.
Matt Baker's 74th-minute header ended Crewe's four-match winning streak and halted the Exiles' three-game losing run.
County almost took the lead on the half-hour mark when Crewe goalkeeper Filip Marschall misjudged a ball over the top and Courtney Baker-Richardson looked certain to roll the ball into the empty net, but former Exiles hero Mickey Demetriou produced a superb last-ditch tackle.
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The home fans did not have to wait long for the opener, however, as Cameron Evans rifled a shot into the top corner from 20 yards out in the 33rd minute.
Bobby Kamwa so nearly doubled the hosts' lead with a side-footed effort that beat Marschall but hit a post.
And Crewe went straight up the other end to level in the 71st minute as substitute Adrien Thibaut finished off a lightning-quick break for a debut goal.
But County responded three minutes later when Baker climbed high at the far post to head in Anthony Glennon's cross.