Monaco, Toulouse both held goal-less
Jeremy Toulalan nearly scored a stunning late winner for Monaco, but his 30-yard effort smashed off the woodwork.
Monaco striker Emmanuel Riviere had scored four goals in two matches and he had several chances to add to his tally, notably in the 19th minute when he cut in between two defenders into the penalty area and unleashed a shot which was parried by Ali Ahamada. Radamel Falcao had his follow-up blocked.
Yannick Ferreira Carrasco missed a golden chance for Monaco as he pounced on a loose ball in the area but blasted over from four yards out.
Toulouse's only real chance was when Oscar Trejo fired inches wide of the right upright.
The match was played in an empty stadium as punishment following crowd trouble in Monaco's match against Le Mans last season.
Monaco, which was promoted as Ligue 2 winners, was looking to make it three wins out of three. The last promoted side to have achieved that feat was Toulouse, 31 years ago.
''It was a very good match,'' Monaco coach Claudio Ranieri said. ''We played well in the first half. We just lacked a goal. In contrast, there was a lot of nervousness in our team in the second half. The players wanted to win, they were looking for the goal.
''But it's not possible to win every match. Moreover, the atmosphere was very difficult. The players are used to playing in front of fans. This type of team is defensive. It's normal. We were expecting that. But I am fairly satisfied.''
Toulouse has two points from its opening three matches.
''It's a good point that wasn't easy to get,'' Toulouse coach Alain Casanova said. ''I haven't seen my team play like that in a long time: helping each other out, showing solidarity and being unselfish.
''Of course we suffered a lot in the first half. But in the second half we corrected a lot of things, they didn't create any chances apart from Toulalan's shot off the crossbar. We could even have left with a victory, although that would have been tough on Monaco.''