使用NSURLSession时CFNetwork SSLHandshake失败（-9806）错误当appfor backgroundfor uploadTask时

I am facing a CFNetwork SSL Handshake error while uploading a video file using NSURLSession UploadTask when the App is in background. There is no problem uploading the videos when the app is in foreground. Problem arises only when the app is in background.I am facing a CFNetwork SSL Handshake error whi