Here's the log info:
2018-20-08 13:28:01.308 Opening log file.
2018-20-08 13:28:01.824 INFO Sftp(1) Info: Connecting to ftp.decisioncloud.me:22 using Sftp 2.0.3484.0.
2018-20-08 13:28:01.981 DEBUG Sftp(1) SSH: Server is 'SSH-2.0-OpenSSH7.4'.
2018-20-08 13:28:02.121 VERBOSE Sftp(1) SSH: Received packet SSHMSGKEXINIT (1265 bytes).
2018-20-08 13:28:02.136 DEBUG Sftp(1) SSH: Negotiation started.
2018-20-08 13:28:02.136 VERBOSE Sftp(1) SSH: Sending packet SSHMSGKEXINIT (504 bytes).
2018-20-08 13:28:02.152 DEBUG Sftp(1) SSH: Group exchange.
2018-20-08 13:28:02.152 VERBOSE Sftp(1) SSH: Sending packet SSHMSGKEXDHINIT (16 bytes).
2018-20-08 13:28:02.292 VERBOSE Sftp(1) SSH: Received packet SSHMSGUNIMPLEMENTED (5 bytes).
2018-20-08 13:28:02.324 DEBUG Sftp(1) SSH: Negotiation failed: Rebex.Net.SshException: Key exchange failed. Requested service is not implemented. ---> Rebex.Net.SshException: Requested service is not implemented.
at Rebex.Net.SshSession.OnTransportPacketReceived(Byte[] buffer, Int32 offset, Int32 count)
at Rebex.Net.SshSession.Process(Int64& receivedPacketCount, Boolean returnIfNotAvailable)
at Rebex.Net.SshSession.ReceivePacket(SshLayer layer)
at Rebex.Net.SshDiffieHellmanGroupExchangeNegotiation.Negotiate(SshSession session, Byte[] VC, Byte[] VS, Byte[] IC, Byte[] IS, Byte[]& K, Byte[]& H, Byte[]& KS)
at Rebex.Net.SshSession.Negotiate(Byte[] IS)
--- End of inner exception stack trace ---
at Rebex.Net.SshSession.Negotiate(Byte[] IS)
2018-20-08 13:28:02.324 ERROR Sftp(1) SSH: Rebex.Net.SshException: Key exchange failed. Requested service is not implemented. ---> Rebex.Net.SshException: Requested service is not implemented.
at Rebex.Net.SshSession.OnTransportPacketReceived(Byte[] buffer, Int32 offset, Int32 count)
at Rebex.Net.SshSession.Process(Int64& receivedPacketCount, Boolean returnIfNotAvailable)
at Rebex.Net.SshSession.ReceivePacket(SshLayer layer)
at Rebex.Net.SshDiffieHellmanGroupExchangeNegotiation.Negotiate(SshSession session, Byte[] VC, Byte[] VS, Byte[] IC, Byte[] IS, Byte[]& K, Byte[]& H, Byte[]& KS)
at Rebex.Net.SshSession.Negotiate(Byte[] IS)
--- End of inner exception stack trace ---
at Rebex.Net.SshSession.Negotiate(Byte[] IS)
at Rebex.Net.SshSession.Negotiate()
2018-20-08 13:28:02.339 ERROR Sftp(1) Info: Rebex.Net.SshException: Key exchange failed. Requested service is not implemented. ---> Rebex.Net.SshException: Requested service is not implemented.
at Rebex.Net.SshSession.OnTransportPacketReceived(Byte[] buffer, Int32 offset, Int32 count)
at Rebex.Net.SshSession.Process(Int64& receivedPacketCount, Boolean returnIfNotAvailable)
at Rebex.Net.SshSession.ReceivePacket(SshLayer layer)
at Rebex.Net.SshDiffieHellmanGroupExchangeNegotiation.Negotiate(SshSession session, Byte[] VC, Byte[] VS, Byte[] IC, Byte[] IS, Byte[]& K, Byte[]& H, Byte[]& KS)
at Rebex.Net.SshSession.Negotiate(Byte[] IS)
--- End of inner exception stack trace ---
at Rebex.Net.SshSession.Negotiate(Byte[] I_S)
at Rebex.Net.SshSession.Negotiate()
at Rebex.Net.Sftp.Connect(String serverName, Int32 serverPort, SshParameters parameters)