10-man Forest Green were forced to settle for another point at home after a Tom Pope penalty.
Rovers took the lead through Carl Winchester after 15 minutes but a 73rd minute penalty and a red card for Farrend Rawson meant FGR’s first home win of the season will have to wait.
Although Forest Green looked slightly more dangerous going forward in the opening exchanges, it was the visitors who went the closest inside the first 10 minutes. After Robert Sanchez was forced to palm away a shot from outside the area, a second effort came in which striker Pope flicked just wide of the post.
Five minutes later FGR took the lead with their first real chance of the game as Joseph Mills whipped an excellent free-kick from the right-hand side and Winchester was on hand to powerfully head home the bouncing ball at the back post.
With half an hour played at The New Lawn the visitors created their second chance of the as Luke Hannant had a chance to deliver a free-kick from the left but it came to nothing and Liam Shephard was able to clear.
Eight minutes later The Valiants had another set piece but once again the FGR defence was able to deal with the situation and this time, set up a counter-attack.
Having caught the corner, Sanchez quickly set Reuben Reid on his way and although the Rovers man broke quickly and found Mills on the right, the move eventually broke down as Mills’ cross was well caught by Scott Brown.
Port Vale seemed to kick into life with 20 minutes to play and after 72 minutes they had a golden chance to level up the scores.
Substitute Ricky Miller raced into the area and, with Rawson trying to make a challenge, the referee pointed to the spot.
As would be expected, Pope powerfully smashed the ball high into the net leaving Sanchez no chance.
Minutes later, FGR were dealt another blow as Rawson tried to prevent a Vale counter attack but his challenge was rash and mistimed and the referee had no option to send him for an early bath.
Both sides pushed to find a winner and 90 minutes on the clock Rovers almost found one as Reid did well to hold the ball up before setting it to Dayle Grubb on the edge of the area but the midfielder’s effort flashed just wide.