Aaron Hunwicks had put Michael Walther's men ahead on 16 minutes, before Roddy Lemba doubled the lead on the half-hour mark.
Forest hit back in the second-half as goals from Paul Scott and Christian Owusu, on 46 and 58 minutes, secured a point for the hosts.
'Side are back in action on Saturday when the host Basildon United at Cricklefields. Kick-off for that match is at 3pm.