SFTP with JSch does not close session but only the channel

Current Situation

• When calling the method CloseConnection() with SFTP implemented by JSch (JCraft) then only the channel will be closed. The session is still open and holds the connections to the SFTP server.
• When using SFTP with JOE the number of sessions increases endlessly.
• The method CloseSession() has no effect, as it also closes the channel.

Desired Behavior

• The method CloseSession() should close the session.