Janko's rasping first-half volley was incorrectly ruled out for offside, a decision that incensed the home side, who are now seven games without a win and will wonder what could have been.
Sydney goalkeeper Vedran Janjetovic was rarely called upon in the first 55 minutes, but a sloppy error from him almost presented the visitors with a simple goal.
Janjetovic looked like he would claim a David Carney corner easily, but the ball slipped through his hands to give Adrian Madaschi a glorious chance to score.
The draw means the Jets, who are second bottom, avoided a third successive defeat.
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