Unable to agree upon server-to-client encryption algorithm

[rromeijn]

een scanner probeert via sftp bestanden rechtstreeks op de Synology te scannen.
echter wil het uploaden niet lukken
(exact de zelfde inlog gegevens e.d. via bijvoorbeeld filezilla werkt wel)
onderstaande log hebben we van de scanner ontvangen.
heeft iemand een idee wat hier aan de hand is en hoe het opgelost kan worden.
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E 11:17:03:42 11-20 - ProcessDestination::SftpUpload():Connect                ChilkatLog:
  Connect:
    DllDate: Jun 10 2010
    UnlockPrefix: KODAK4SSH
    Username: Administrator
    Component: .NET 2.0
    SftpVersion: 0
    hostname: xxx.xxxxxx.nl
    port: 22
    ConnectTimeoutMs: 30000
    myIP: x.x.x.x
    myPort: 1037
    connect successful.
    Established TCP/IP connection with SSH server
    clientIdentifier: SSH-2.0-PuTTY_Local:_May_11_2009_17:22:38
    FromServer: SSH-2.0-OpenSSH_6.6p2-hpn14v4

    serverVersion: SSH-2.0-OpenSSH_6.6p2-hpn14v4
    KeyExchangeAlgs:
      algorithm: curve25519-sha256@libssh.org
      algorithm: ecdh-sha2-nistp256
      algorithm: ecdh-sha2-nistp384
      algorithm: ecdh-sha2-nistp521
      algorithm: diffie-hellman-group-exchange-sha256
      algorithm: diffie-hellman-group14-sha1
    HostKeyAlgs:
      algorithm: ssh-rsa
      algorithm: ssh-dss
      algorithm: ecdsa-sha2-nistp256
    EncCS:
      algorithm: aes128-ctr
      algorithm: aes192-ctr
      algorithm: aes256-ctr
      algorithm: aes128-gcm@openssh.com
      algorithm: aes256-gcm@openssh.com
      algorithm: chacha20-poly1305@openssh.com
    EncSC:
      algorithm: aes128-ctr
      algorithm: aes192-ctr
      algorithm: aes256-ctr
      algorithm: aes128-gcm@openssh.com
      algorithm: aes256-gcm@openssh.com
      algorithm: chacha20-poly1305@openssh.com
    MacCS:
      algorithm: umac-64-etm@openssh.com
      algorithm: umac-128-etm@openssh.com
      algorithm: hmac-sha2-256-etm@openssh.com
      algorithm: hmac-sha2-512-etm@openssh.com
      algorithm: hmac-sha1-etm@openssh.com
      algorithm: umac-64@openssh.com
      algorithm: umac-128@openssh.com
      algorithm: hmac-sha2-256
      algorithm: hmac-sha2-512
      algorithm: hmac-sha1
    MacSC:
      algorithm: umac-64-etm@openssh.com
      algorithm: umac-128-etm@openssh.com
      algorithm: hmac-sha2-256-etm@openssh.com
      algorithm: hmac-sha2-512-etm@openssh.com
      algorithm: hmac-sha1-etm@openssh.com
      algorithm: umac-64@openssh.com
      algorithm: umac-128@openssh.com
      algorithm: hmac-sha2-256
      algorithm: hmac-sha2-512
      algorithm: hmac-sha1
    CompCS:
      algorithm: none
      algorithm: zlib@openssh.com
    CompSC:
      algorithm: none
      algorithm: zlib@openssh.com
    Unable to agree upon server-to-client encryption algorithm.
    Unable to agree upon client-to-server encryption algorithm.
    MAC: HMAC-SHA1
    MAC: HMAC-SHA1
    Compression: none
    Compression: none
    Key Exchange: DH Group Exchange SHA256
    Host Key Algorithm: DSS
    numBits: 128
    pbits: 1024
    Using GEX Group.
    Sending KEX_DH_GEX_REQUEST...
    pbits: 1024
    numBytesRequested: 8
    Connection closed by server.
    Failed to read data on SSH connection.
    Failed to read KEX_DH_GEX_REQUEST response
    Failed.