We are trying to connect to an Sftp server, but what worked in our testing environment isn't working on our production environment. we keep running into a "Received invalid packet" when the key negotiation is in progress. The odd thing is with Filezilla we can build up a connection so in terms of infrastructure(firewalls etc) we seem to be oke. What could be the cause, and what possible workarounds can we try?
Btw I should explain we are actually doing these tests with the winform sample program.
Here's the verbose log
06:36:58.514 Info Info: Connecting to <ommitted ip:port> using Sftp 2.0.4086.0.
06:36:58.592 Debug SSH: Server is 'SSH-2.0-XFB.Gateway Unix'.
06:36:58.607 Info SSH: Negotiation started.
06:36:58.639 Verbose SSH: Sending packet SSH_MSG_KEXINIT (629 bytes).
14-2E-7B-FB-7A-41-DD-3E-9D-53-1D-3A-C5-5C-19-AB-70-00-00-00-1A-64-69-66
66-69-65-2D-68-65-6C-6C-6D-61-6E-2D-67-72-6F-75-70-31-2D-73-68-61-31-00
00-00-0F-73-73-68-2D-64-73-73-2C-73-73-68-2D-72-73-61-00-00-00-F1-61-65
73-32-35-36-2D-63-74-72-2C-61-65-73-31-39-32-2D-63-74-72-2C-61-65-73-31
32-38-2D-63-74-72-2C-61-65-73-32-35-36-2D-63-62-63-2C-61-65-73-31-39-32
2D-63-62-63-2C-61-65-73-31-32-38-2D-63-62-63-2C-33-64-65-73-2D-63-74-72
2C-33-64-65-73-2D-63-62-63-2C-74-77-6F-66-69-73-68-32-35-36-2D-63-74-72
2C-74-77-6F-66-69-73-68-31-39-32-2D-63-74-72-2C-74-77-6F-66-69-73-68-31
32-38-2D-63-74-72-2C-74-77-6F-66-69-73-68-32-35-36-2D-63-62-63-2C-74-77
6F-66-69-73-68-31-39-32-2D-63-62-63-2C-74-77-6F-66-69-73-68-31-32-38-2D
63-62-63-2C-74-77-6F-66-69-73-68-2D-63-62-63-2C-62-6C-6F-77-66-69-73-68
2D-63-74-72-2C-62-6C-6F-77-66-69-73-68-2D-63-62-63-2C-61-72-63-66-6F-75
72-32-35-36-2C-61-72-63-66-6F-75-72-31-32-38-2C-61-72-63-66-6F-75-72-00
00-00-F1-61-65-73-32-35-36-2D-63-74-72-2C-61-65-73-31-39-32-2D-63-74-72
2C-61-65-73-31-32-38-2D-63-74-72-2C-61-65-73-32-35-36-2D-63-62-63-2C-61
65-73-31-39-32-2D-63-62-63-2C-61-65-73-31-32-38-2D-63-62-63-2C-33-64-65
73-2D-63-74-72-2C-33-64-65-73-2D-63-62-63-2C-74-77-6F-66-69-73-68-32-35
36-2D-63-74-72-2C-74-77-6F-66-69-73-68-31-39-32-2D-63-74-72-2C-74-77-6F
66-69-73-68-31-32-38-2D-63-74-72-2C-74-77-6F-66-69-73-68-32-35-36-2D-63
62-63-2C-74-77-6F-66-69-73-68-31-39-32-2D-63-62-63-2C-74-77-6F-66-69-73
68-31-32-38-2D-63-62-63-2C-74-77-6F-66-69-73-68-2D-63-62-63-2C-62-6C-6F
77-66-69-73-68-2D-63-74-72-2C-62-6C-6F-77-66-69-73-68-2D-63-62-63-2C-61
72-63-66-6F-75-72-32-35-36-2C-61-72-63-66-6F-75-72-31-32-38-2C-61-72-63
66-6F-75-72-00-00-00-12-68-6D-61-63-2D-73-68-61-31-2C-68-6D-61-63-2D-6D
64-35-00-00-00-12-68-6D-61-63-2D-73-68-61-31-2C-68-6D-61-63-2D-6D-64-35
00-00-00-04-6E-6F-6E-65-00-00-00-04-6E-6F-6E-65-00-00-00-00-00-00-00-00
00-00-00-00-00
06:36:58.654 Verbose SSH: Received packet SSH_MSG_KEXINIT (268 bytes).
14-1D-7E-36-E4-49-EB-A1-7C-10-71-83-07-B9-54-4B-F4-00-00-00-3D-64-69-66
66-69-65-2D-68-65-6C-6C-6D-61-6E-2D-67-72-6F-75-70-31-2D-73-68-61-31-2C
64-69-66-66-69-65-2D-68-65-6C-6C-6D-61-6E-2D-67-72-6F-75-70-2D-65-78-63
68-61-6E-67-65-2D-73-68-61-31-00-00-00-1F-73-73-68-2D-72-73-61-2C-73-73
68-2D-64-73-73-2C-78-35-30-39-76-33-2D-73-69-67-6E-2D-72-73-61-00-00-00
13-61-65-73-31-32-38-2D-63-62-63-2C-33-64-65-73-2D-63-62-63-00-00-00-13
61-65-73-31-32-38-2D-63-62-63-2C-33-64-65-73-2D-63-62-63-00-00-00-22-68
6D-61-63-2D-73-68-61-32-35-36-2C-68-6D-61-63-2D-73-68-61-31-2D-39-36-2C
68-6D-61-63-2D-73-68-61-31-00-00-00-22-68-6D-61-63-2D-73-68-61-32-35-36
2C-68-6D-61-63-2D-73-68-61-31-2D-39-36-2C-68-6D-61-63-2D-73-68-61-31-00
00-00-04-6E-6F-6E-65-00-00-00-04-6E-6F-6E-65-00-00-00-00-00-00-00-00-00
00-00-00-00
06:36:58.701 Debug SSH: Negotiating key.
06:36:58.779 Verbose SSH: Sending packet SSH_MSG_KEXDH_INIT (134 bytes).
1E-00-00-00-81-00-89-53-3F-8E-DB-AB-02-06-9D-87-5B-E0-B2-63-FA-83-7F-E8
25-0F-8A-C7-06-3C-7B-A2-01-5C-00-E7-AC-61-B4-23-4B-38-03-93-6A-19-2A-D0
E4-FA-70-09-CF-6F-D5-3E-4E-8A-2E-4C-DB-D0-EA-8B-14-EB-27-47-BD-29-D4-86
F2-7A-A0-C9-62-A6-79-35-F2-C4-AA-F0-E5-2D-94-02-4C-4E-B8-FF-8A-B6-1A-8E
00-90-87-85-DB-18-E6-A8-A1-24-B3-1B-67-F9-20-89-DC-B9-DD-23-8C-94-41-14
F8-66-99-EF-2C-58-D4-BE-A9-AF-96-74-F1-C6
06:36:58.811 Verbose SSH: Sending packet SSH_MSG_DISCONNECT (36 bytes).
01-00-00-00-02-00-00-00-17-52-65-63-65-69-76-65-64-20-69-6E-76-61-6C-69
64-20-70-61-63-6B-65-74-00-00-00-00
06:36:58.826 Debug SSH: Negotiation failed: Rebex.Net.SshException: Key exchange failed. Received invalid packet. ---> Rebex.Net.SshException: Received invalid packet.
at wWGvS.dHcxv.AcUJKJ(Byte[] )
at Rebex.Net.SshSession.AePCoRZ(Byte[]& )
at Rebex.Net.SshSession.cDtmAOZ(cMbfbTZ , Object[] )
at Rebex.Net.SshSession.CFLiXJ(ANiLIV )
at wWGvS.miMck.ArwjUr(SshSession , Byte[] , Byte[] , Byte[] , Byte[] , Byte[]& , Byte[]& , Byte[]& )
at Rebex.Net.SshSession.ArwjUr(Byte[] )
--- End of inner exception stack trace ---
at Rebex.Net.SshSession.ArwjUr(Byte[] )
06:36:58.842 Error SSH: Rebex.Net.SshException: Key exchange failed. Received invalid packet. ---> Rebex.Net.SshException: Received invalid packet.
at wWGvS.dHcxv.AcUJKJ(Byte[] )
at Rebex.Net.SshSession.AePCoRZ(Byte[]& )
at Rebex.Net.SshSession.cDtmAOZ(cMbfbTZ , Object[] )
at Rebex.Net.SshSession.CFLiXJ(ANiLIV )
at wWGvS.miMck.ArwjUr(SshSession , Byte[] , Byte[] , Byte[] , Byte[] , Byte[]& , Byte[]& , Byte[]& )
at Rebex.Net.SshSession.ArwjUr(Byte[] )
--- End of inner exception stack trace ---
at Rebex.Net.SshSession.ArwjUr(Byte[] )
at Rebex.Net.SshSession.bOtYJuZ()
at Rebex.Net.SshSession.Negotiate()
06:36:58.857 Error Info: Rebex.Net.SshException: Key exchange failed. Received invalid packet. ---> Rebex.Net.SshException: Received invalid packet.
at wWGvS.dHcxv.AcUJKJ(Byte[] )
at Rebex.Net.SshSession.AePCoRZ(Byte[]& )
at Rebex.Net.SshSession.cDtmAOZ(cMbfbTZ , Object[] )
at Rebex.Net.SshSession.CFLiXJ(ANiLIV )
at wWGvS.miMck.ArwjUr(SshSession , Byte[] , Byte[] , Byte[] , Byte[] , Byte[]& , Byte[]& , Byte[]& )
at Rebex.Net.SshSession.ArwjUr(Byte[] )
--- End of inner exception stack trace ---
at Rebex.Net.SshSession.ArwjUr(Byte[] )
at Rebex.Net.SshSession.bOtYJuZ()
at Rebex.Net.SshSession.Negotiate()
at Rebex.Net.Sftp.Connect(String serverName, Int32 serverPort, SshParameters parameters)