As in recent matches, the hosts spurned chances to take the lead before Nick Steadman put the visitors ahead in the first half. They then missed opportunities of their own to stretch their lead and were made to pay when the influential Mike Hardiman equalised after the break.
O’s then almost went ahead through Mark Leigh but also had a scare of their own in the last five minutes when their own crossbar was struck by a Portishead attacker.
Team: Perry, Planter, Day, Leigh, Davies, Hardiman, Allen, Dias, Carter, Harris, Jenkins.
Subs: Hutton, Douglas