Marcus Kelly gave Forest Green caretaker manager Scott Bartlett a winning finale against Nuneaton.
Ed Asafu-Adjaye made a crucial early block to deny Boro's Wesley York before goalkeeper Sam Russell foiled Louis Moult from the resulting corner.
Kelly then smashed home James Norwood's cross to punish the visitors.
who was named Dave Hockaday's successor on Tuesday,
will take charge for the first time against Lincoln on Saturday.
VIEWS FROM THE DRESSING ROOM
Forest Green Rovers manager Adrian Pennock told BBC Gloucestershire:
"We were a little bit nervous in the first 20 minutes and then we settled down a bit and got a cracking goal.
"I met the players at 6.15 this evening. Scott (Bartlett, academy boss) has been preparing the team.
"I didn't want to sit in the stand - I wanted to get involved straight away. Overall, I was really pleased with the result."
Forest Green Rovers 01 Russell 22 Green 02 Hodgkiss 12 Asafu-Adjaye 06 Bennett 05 Turley 08 Klukowski 04 Bangura 24 Kelly 09 Wright 07 Norwood (Vieira - 75' ) Substitutes 10 Vieira (Styche - 84' ) 11 Forbes 28 McHugh 19 Styche 16 Racine Nuneaton Town 19 Belshaw 03 Bell 15 Gordon 05 Dean 20 Trainer 13 Sleath 07 Armson 11 Streete 26 Hibbert 09 Moult 16 York Substitutes 06 Walker 08 Adams 24 Delfouneso 17 Taylor 27 Ladapo
Ref: Simon Bennett