PARIS — A French appeals court Wednesday rejected a demand from Dominique Strauss-Kahn to dismiss an investigation of him in connection with a ring that recruited prostitutes for sex parties from Paris to Washington.
His appeal was an effort to end the last of the legal problems that forced him to resign as managing director of the International Monetary Fund and ruined his ambition to seek the French presidency.
Strauss-Kahn, 63, and his lawyers vowed to challenge the ruling .
In the case, nine people in Lille are under investigation for procurement of prostitutes, and, in some cases, fraud. Strauss-Kahn has said he was unaware that prostitutes were involved in the parties.
His lawyers had questioned the impartiality of judges, citing the leak of transcripts of his testimony when he was questioned by investigators.
In October, the prosecutor’s office in Lille dropped sexual assault charges against Strauss-Kahn after an ‘‘escort girl’’ withdrew her complaint about an incident in Washington in December 2010.