Exception: Error opening sftp connection

Hi,

Our Team has reported some of issue to Matillion Team, they asked us to do the latest update 1.76.3 for the solution and some fixes are corrected in that version reported by us said by them. So, we done that update and we are getting some new issue in file iterator and data transfer component after that update "Exception: Error opening sftp connection" can't be able to connect to the sftp server before that update we can be able to access it. So may I know what reason for it. Its title urgent.