Biztalk 2010 Receive location intermittently stops reading files from FTP server.

Recently had a very interesting case. The biztalk 2010 FTP adapter would read messages but if there is a gap of 10-15min where the Server did not have files to give to the Biztalk FTP Receive Location, the Biztalk Service would report Error 500 – Failed to connect to FTP Server. A network monitor trace basically…