title: Spring Integration Sftp failed to upload but simple Jsch upload is ok. Why?
body: <p>I use Spring Integration SFTP to upload files to a sftp server. When I send some concurrent requests or heavy files, I received Socket Clode exception.
  But when I send directly the same file with simple Jsch client, even with concurrent calls, everything seems to be ok.</p>
  <p>I use default config for both libraries. Spring SFTP uses Jsch, does it configure in such a way it could cause the error ? Is there a special configuration or operation made by Spring but not in the default configuration or behavior than simple Jsch ?</p>