3769697 - SFTP Sender Exception: com.jcraft.jsch.JSchException: Session.connect: java.io.IOException: End of IO Stream Read

• Sender SFTP channel fails with below error and fails to establish a session to the SFTP server.
• SFTP Server vendor performed security hardening, changes etc
• SFTP adapter traces show the SSH handshake progressing until authentication stage before the session is terminated.
  

  SSH_MSG_SERVICE_REQUEST sent

  SSH_MSG_EXT_INFO received

  server-sig-algs=<...>

  Disconnecting from <SFTP_HOST> port <PORT>

  Catching com.jcraft.jsch.JSchException: Session.connect: java.io.IOException: End of IO Stream Read
  at com.sap.aii.adapter.sftp.ra.rar.integration.sftp.SSHConnection.<init>(SSHConnection.java..)
  at com.sap.aii.adapter.sftp.ra.rar.jca.SFTP2XI.getConnection(SFTP2XI.java..)
  at com.sap.aii.adapter.sftp.ra.rar.jca.SFTP2XI.sftpConnection(SFTP2XI.java..)
  at com.sap.aii.adapter.sftp.ra.rar.jca.SFTP2XI.invoke(SFTP2XI.java..)
  
  Unable to connect due to SFTP connectivity failed due to JSCH exception. Error message is: Session.connect: java.io.IOException: End of IO Stream Read! 
  
  
• SFTP vendor traces may indicate that the SSH connection is accepted and initial SSH negotiation is performed before the session is terminated.
  

  CONNECT [SESSION_ID] - Incoming connection request on SSH SFTP listener at <SFTP_SERVER_IP>:<PORT> accepted from <CLIENT_IP>:<SOURCE_PORT>

  INFO [SESSION_ID] - Client Identification: <SFTP_CLIENT_IDENTIFIER>

  CONNECT [SESSION_ID] - Agreed upon KEX: '<KEX_ALGORITHM>' Host Key: '<HOST_KEY_ALGORITHM>' C2S: '<CIPHER_DETAILS>' S2C: '<CIPHER_DETAILS>'

  CONNECT [SESSION_ID] - Disconnect reason: Connection terminated by the client.

• SAP NetWeaver
• SAP Process Integration
• SAP Process Orchestration

SFTP, java.io.IOException: End of IO Stream Read, JSCH, Connection terminated by the client, SSH algorithm mismatch, mismatch, preferredKeyType, ssh-rsa, SAP PI/PO SFTP Adapter, JSchException , KBA , BC-XI-CON-SFT , Secure File Transfer Protocol Adapter , Problem