connection yii with sql server 2005 on IIS7

Dear master Yii,

please help me, i heve problem with connection yii on IIS7 with sql server 2005. please help me. Thank’s

C:\pnm\framework\db\CDbConnection.php(382)




370                 throw new CDbException('CDbConnection.connectionString cannot be empty.');

371             try

372             {

373                 Yii::trace('Opening DB connection','system.db.CDbConnection');

374                 $this->_pdo=$this->createPdoInstance();

375                 $this->initConnection($this->_pdo);

376                 $this->_active=true;

377             }

378             catch(PDOException $e)

379             {

380                 if(YII_DEBUG)

381                 {[b][b]

382                     throw new CDbException('CDbConnection failed to open the DB connection:[/b][/b] '.

383                         $e->getMessage(),(int)$e->getCode(),$e->errorInfo);

384                 }

385                 else

386                 {

387                     Yii::log($e->getMessage(),CLogger::LEVEL_ERROR,'exception.CDbException');

388                     throw new CDbException('CDbConnection failed to open the DB connection.',(int)$e->getCode(),$e->errorInfo);

389                 }

390             }

391         }

392     }

393 

394     /**



What’s the error message from the server?