Eto'o struck his 88th-minute penalty against the crossbar, reviving memories of another late missed spot-kick that cost Cameroon a place at the 2006 FIFA World Cup™ in Germany.
Congo DR play in Mauritius tomorrow and even a draw would lift them above Cameroon, in a competition where only the group winners are guaranteed places at the 16-nation tournament hosted by Gabon and Equatorial Guinea.
Their campaign got off to a perfect start with a Mamadou Niang hat-trick inspiring a shock 4-2 triumph in Congo DR, and a 7-0 mauling of Mauritius in Dakar followed.
West Ham United striker Demba Ba, an injury absentee in Yaounde, scored a last-gasp winner at home to Cameroon three months ago, and another home win when the Congolese visit Dakar in September will clinch first place.
Uganda edge closer to qualification
Uganda boosted their chances of returning to the Africa Cup of Nations after a 34-year absence by completing a double over Guinea-Bissau with a 2-0 victory before a huge crowd at Namboole Stadium near Kampala.
A Godfrey Walusimbi cross landed in the net two minutes before half-time after Uganda had laid siege to the visitors' goalmouth, and David Obua set up Geofrey Massa for the second goal on 62 minutes.
Angola and Kenya clash tomorrow in Luanda and while both harbour hopes of winning Group J, Uganda can take an unassailable lead by defeating the latter during September in another home fixture.
Christopher Katongo struck twice before recalled veteran striker Collins Mbesuma completed the rout after 53 minutes, and the only disappoinment for the home team was the late red card shown to midfielder Isaac Chansa.
Namibia played Burkina Faso, who romped to a 4-1 win in Windhoek. Abdulrazak Traore opened the floodgates just 12 minutes after kick-off, Aristide Bance and Alain Traore converted second half penalties, and Jonathan Pitroipa struck in stoppage time after Tangeni Shipahu reduced arrears.
South Africa top the table with seven points followed by Niger [six], Sierra Leone [five] and record seven-time African champions Egypt have just one ahead of a critical clash with Bafana Bafana in Cairo tomorrow.