Ultimate SFTP - Server signature is not valid Error

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I would like to open a Support ticket for Ultimate SFTP We are encounter an issue using Ultimate SFTP. When attempting to connect to a new SFTP Server we are receiving an error that the "Server signature is not valid", FileZilla connects but not our ComponentPro SFTP DLL. We don't do anything to specify the encryption/hash algorithms in our code, or to verify the host key. ComponentPro References: • https://doc.componentpro.com/ComponentPro-Sftp/connection-settings,-connection-info-and-connection-state • https://doc.componentpro.com/ComponentPro-Sftp/validate-the-key-sent-by-the-server Is there a possibility that ComponentPro SFTP is caching the key, and sees the same encryption but different hash key as invalid? We've tried to find any key cache (like FileZilla uses), but haven't found it so far. Someone with the same issue, but the only recommendation was from another user, to explicitly set the algorithms. Apparently ComponentPro negotiation may be flaky: https://www.componentpro.com/qa/negotiation-failed-server-signature-not-valid-v6-8-4119 See log below: Sftp: 1, Thread Id: 0 [10/28/2019 08:55:16.60] Information - Info: Connecting to ftp.complianceline.com:22 - Ultimate Sftp v7.0.40.226 for .NET 4.0 -> 4.7.x (Production). [10/28/2019 08:55:16.82] Verbose - Ssh: Sending data: 0000 |53-53-48-2D-32-2E-30-2D 43-6F-6D-70-6F-6E-65-6E| SSH-2.0-Componen 0010 |74-50-72-6F-53-53-48-5F 37-2E-30-2E-34-30-2E-32| tProSSH_7.0.40.2 0020 |32-36-0D-0A | 26.. [10/28/2019 08:55:16.83] Verbose - Ssh: Received data: 0000 |53-53-48-2D-32-2E-30-2D 57-69-6E-67-46-54-50-53| SSH-2.0-WingFTPS 0010 |65-72-76-65-72-0D-0A | erver.. [10/28/2019 08:55:16.83] Debug - Ssh: Server is 'SSH-2.0-WingFTPServer'. [10/28/2019 08:55:16.85] Information - Ssh: Negotiation started. [10/28/2019 08:55:16.94] Verbose - Ssh: Sending packet SSH_MSG_KEXINIT (1125 bytes). 0000 |14-72-8A-F9-3D-1C-B0-0A 57-F1-C3-12-09-11-25-19| .r..=...W.....%. 0010 |AA-00-00-00-D0-64-69-66 66-69-65-2D-68-65-6C-6C| .....diffie-hell 0020 |6D-61-6E-2D-67-72-6F-75 70-2D-65-78-63-68-61-6E| man-group-exchan 0030 |67-65-2D-73-68-61-32-35 36-2C-64-69-66-66-69-65| ge-sha256,diffie 0040 |2D-68-65-6C-6C-6D-61-6E 2D-67-72-6F-75-70-31-34| -hellman-group14 0050 |2D-73-68-61-32-35-36-2C 64-69-66-66-69-65-2D-68| -sha256,diffie-h 0060 |65-6C-6C-6D-61-6E-2D-67 72-6F-75-70-31-35-2D-73| ellman-group15-s 0070 |68-61-35-31-32-2C-64-69 66-66-69-65-2D-68-65-6C| ha512,diffie-hel 0080 |6C-6D-61-6E-2D-67-72-6F 75-70-31-36-2D-73-68-61| lman-group16-sha 0090 |35-31-32-2C-64-69-66-66 69-65-2D-68-65-6C-6C-6D| 512,diffie-hellm 00A0 |61-6E-2D-67-72-6F-75-70 2D-65-78-63-68-61-6E-67| an-group-exchang 00B0 |65-2D-73-68-61-31-2C-64 69-66-66-69-65-2D-68-65| e-sha1,diffie-he 00C0 |6C-6C-6D-61-6E-2D-67-72 6F-75-70-31-34-2D-73-68| llman-group14-sh 00D0 |61-31-2C-65-63-64-68-2D 73-68-61-32-2D-6E-69-73| a1,ecdh-sha2-nis 00E0 |74-70-32-35-36-00-00-00 93-73-73-68-2D-64-73-73| tp256....ssh-dss 00F0 |2C-72-73-61-2D-73-68-61 32-2D-32-35-36-2C-73-73| ,rsa-sha2-256,ss 0100 |68-2D-72-73-61-2D-73-68 61-32-35-36-40-73-73-68| h-rsa-sha256@ssh 0110 |2E-63-6F-6D-2C-72-73-61 2D-73-68-61-32-2D-35-31| .com,rsa-sha2-51 0120 |32-2C-73-73-68-2D-72-73 61-2C-78-35-30-39-76-33| 2,ssh-rsa,x509v3 0130 |2D-73-69-67-6E-2D-72-73 61-2D-73-68-61-32-35-36| -sign-rsa-sha256 0140 |40-73-73-68-2E-63-6F-6D 2C-78-35-30-39-76-33-2D| @ssh.com,x509v3- 0150 |73-69-67-6E-2D-72-73-61 2C-78-35-30-39-76-33-2D| sign-rsa,x509v3- 0160 |73-69-67-6E-2D-64-73-73 2C-65-63-64-73-61-2D-73| sign-dss,ecdsa-s 0170 |68-61-32-2D-6E-69-73-74 70-32-35-36-00-00-00-E7| ha2-nistp256.... 0180 |61-65-73-32-35-36-2D-67 63-6D-40-6F-70-65-6E-73| aes256-gcm@opens 0190 |73-68-2E-63-6F-6D-2C-61 65-73-31-32-38-2D-67-63| sh.com,aes128-gc 01A0 |6D-40-6F-70-65-6E-73-73 68-2E-63-6F-6D-2C-61-65| m@openssh.com,ae 01B0 |73-32-35-36-2D-63-74-72 2C-61-65-73-31-39-32-2D| s256-ctr,aes192- 01C0 |63-74-72-2C-61-65-73-31 32-38-2D-63-74-72-2C-33| ctr,aes128-ctr,3 01D0 |64-65-73-2D-63-74-72-2C 74-77-6F-66-69-73-68-32| des-ctr,twofish2 01E0 |35-36-2D-63-74-72-2C-74 77-6F-66-69-73-68-31-39| 56-ctr,twofish19 01F0 |32-2D-63-74-72-2C-74-77 6F-66-69-73-68-31-32-38| 2-ctr,twofish128 0200 |2D-63-74-72-2C-61-65-73 32-35-36-2D-63-62-63-2C| -ctr,aes256-cbc, 0210 |61-65-73-31-39-32-2D-63 62-63-2C-61-65-73-31-32| aes192-cbc,aes12 0220 |38-2D-63-62-63-2C-33-64 65-73-2D-63-62-63-2C-74| 8-cbc,3des-cbc,t 0230 |77-6F-66-69-73-68-32-35 36-2D-63-62-63-2C-74-77| wofish256-cbc,tw 0240 |6F-66-69-73-68-31-39-32 2D-63-62-63-2C-74-77-6F| ofish192-cbc,two 0250 |66-69-73-68-31-32-38-2D 63-62-63-2C-74-77-6F-66| fish128-cbc,twof 0260 |69-73-68-2D-63-62-63-00 00-00-E7-61-65-73-32-35| ish-cbc....aes25 0270 |36-2D-67-63-6D-40-6F-70 65-6E-73-73-68-2E-63-6F| 6-gcm@openssh.co 0280 |6D-2C-61-65-73-31-32-38 2D-67-63-6D-40-6F-70-65| m,aes128-gcm@ope 0290 |6E-73-73-68-2E-63-6F-6D 2C-61-65-73-32-35-36-2D| nssh.com,aes256- 02A0 |63-74-72-2C-61-65-73-31 39-32-2D-63-74-72-2C-61| ctr,aes192-ctr,a 02B0 |65-73-31-32-38-2D-63-74 72-2C-33-64-65-73-2D-63| es128-ctr,3des-c 02C0 |74-72-2C-74-77-6F-66-69 73-68-32-35-36-2D-63-74| tr,twofish256-ct 02D0 |72-2C-74-77-6F-66-69-73 68-31-39-32-2D-63-74-72| r,twofish192-ctr 02E0 |2C-74-77-6F-66-69-73-68 31-32-38-2D-63-74-72-2C| ,twofish128-ctr, 02F0 |61-65-73-32-35-36-2D-63 62-63-2C-61-65-73-31-39| aes256-cbc,aes19 0300 |32-2D-63-62-63-2C-61-65 73-31-32-38-2D-63-62-63| 2-cbc,aes128-cbc 0310 |2C-33-64-65-73-2D-63-62 63-2C-74-77-6F-66-69-73| ,3des-cbc,twofis 0320 |68-32-35-36-2D-63-62-63 2C-74-77-6F-66-69-73-68| h256-cbc,twofish 0330 |31-39-32-2D-63-62-63-2C 74-77-6F-66-69-73-68-31| 192-cbc,twofish1 0340 |32-38-2D-63-62-63-2C-74 77-6F-66-69-73-68-2D-63| 28-cbc,twofish-c 0350 |62-63-00-00-00-61-68-6D 61-63-2D-73-68-61-32-2D| bc...ahmac-sha2- 0360 |32-35-36-2D-65-74-6D-40 6F-70-65-6E-73-73-68-2E| 256-etm@openssh. 0370 |63-6F-6D-2C-68-6D-61-63 2D-73-68-61-32-2D-32-35| com,hmac-sha2-25 0380 |36-2C-68-6D-61-63-2D-73 68-61-32-2D-35-31-32-2D| 6,hmac-sha2-512- 0390 |65-74-6D-40-6F-70-65-6E 73-73-68-2E-63-6F-6D-2C| etm@openssh.com, 03A0 |68-6D-61-63-2D-73-68-61 32-2D-35-31-32-2C-68-6D| hmac-sha2-512,hm 03B0 |61-63-2D-73-68-61-31-00 00-00-61-68-6D-61-63-2D| ac-sha1...ahmac- 03C0 |73-68-61-32-2D-32-35-36 2D-65-74-6D-40-6F-70-65| sha2-256-etm@ope 03D0 |6E-73-73-68-2E-63-6F-6D 2C-68-6D-61-63-2D-73-68| nssh.com,hmac-sh 03E0 |61-32-2D-32-35-36-2C-68 6D-61-63-2D-73-68-61-32| a2-256,hmac-sha2 03F0 |2D-35-31-32-2D-65-74-6D 40-6F-70-65-6E-73-73-68| -512-etm@openssh 0400 |2E-63-6F-6D-2C-68-6D-61 63-2D-73-68-61-32-2D-35| .com,hmac-sha2-5 0410 |31-32-2C-68-6D-61-63-2D 73-68-61-31-00-00-00-1A| 12,hmac-sha1.... 0420 |6E-6F-6E-65-2C-7A-6C-69 62-2C-7A-6C-69-62-40-6F| none,zlib,zlib@o 0430 |70-65-6E-73-73-68-2E-63 6F-6D-00-00-00-1A-6E-6F| penssh.com....no 0440 |6E-65-2C-7A-6C-69-62-2C 7A-6C-69-62-40-6F-70-65| ne,zlib,zlib@ope 0450 |6E-73-73-68-2E-63-6F-6D 00-00-00-00-00-00-00-00| nssh.com........ 0460 |00-00-00-00-00 | ..... [10/28/2019 08:55:16.94] Verbose - Ssh: Received packet SSH_MSG_KEXINIT (473 bytes). 0000 |14-0A-DB-5E-BD-2B-52-1F AC-82-92-45-D7-93-70-17| ...^. R....E..p. 0010 |DD-00-00-00-66-63-75-72 76-65-32-35-35-31-39-2D| ....fcurve25519- 0020 |73-68-61-32-35-36-40-6C 69-62-73-73-68-2E-6F-72| sha256@libssh.or 0030 |67-2C-65-63-64-68-2D-73 68-61-32-2D-6E-69-73-74| g,ecdh-sha2-nist 0040 |70-32-35-36-2C-64-69-66 66-69-65-2D-68-65-6C-6C| p256,diffie-hell 0050 |6D-61-6E-2D-67-72-6F-75 70-31-34-2D-73-68-61-31| man-group14-sha1 0060 |2C-64-69-66-66-69-65-2D 68-65-6C-6C-6D-61-6E-2D| ,diffie-hellman- 0070 |67-72-6F-75-70-31-2D-73 68-61-31-00-00-00-35-65| group1-sha1...5e 0080 |63-64-73-61-2D-73-68-61 32-2D-6E-69-73-74-70-32| cdsa-sha2-nistp2 0090 |35-36-2C-72-73-61-2D-73 68-61-32-2D-35-31-32-2C| 56,rsa-sha2-512, 00A0 |72-73-61-2D-73-68-61-32 2D-32-35-36-2C-73-73-68| rsa-sha2-256,ssh 00B0 |2D-72-73-61-00-00-00-57 61-65-73-32-35-36-2D-63| -rsa...Waes256-c 00C0 |74-72-2C-61-65-73-31-39 32-2D-63-74-72-2C-61-65| tr,aes192-ctr,ae 00D0 |73-31-32-38-2D-63-74-72 2C-61-65-73-32-35-36-2D| s128-ctr,aes256- 00E0 |63-62-63-2C-61-65-73-31 39-32-2D-63-62-63-2C-61| cbc,aes192-cbc,a 00F0 |65-73-31-32-38-2D-63-62 63-2C-62-6C-6F-77-66-69| es128-cbc,blowfi 0100 |73-68-2D-63-62-63-2C-33 64-65-73-2D-63-62-63-00| sh-cbc,3des-cbc. 0110 |00-00-57-61-65-73-32-35 36-2D-63-74-72-2C-61-65| ..Waes256-ctr,ae 0120 |73-31-39-32-2D-63-74-72 2C-61-65-73-31-32-38-2D| s192-ctr,aes128- 0130 |63-74-72-2C-61-65-73-32 35-36-2D-63-62-63-2C-61| ctr,aes256-cbc,a 0140 |65-73-31-39-32-2D-63-62 63-2C-61-65-73-31-32-38| es192-cbc,aes128 0150 |2D-63-62-63-2C-62-6C-6F 77-66-69-73-68-2D-63-62| -cbc,blowfish-cb 0160 |63-2C-33-64-65-73-2D-63 62-63-00-00-00-25-68-6D| c,3des-cbc...%hm 0170 |61-63-2D-73-68-61-32-2D 32-35-36-2C-68-6D-61-63| ac-sha2-256,hmac 0180 |2D-73-68-61-32-2D-35-31 32-2C-68-6D-61-63-2D-73| -sha2-512,hmac-s 0190 |68-61-31-00-00-00-25-68 6D-61-63-2D-73-68-61-32| ha1...%hmac-sha2 01A0 |2D-32-35-36-2C-68-6D-61 63-2D-73-68-61-32-2D-35| -256,hmac-sha2-5 01B0 |31-32-2C-68-6D-61-63-2D 73-68-61-31-00-00-00-04| 12,hmac-sha1.... 01C0 |6E-6F-6E-65-00-00-00-04 6E-6F-6E-65-00-00-00-00| none....none.... 01D0 |00-00-00-00-00-00-00-00 00 | ......... [10/28/2019 08:55:16.96] Debug - Ssh: Negotiating key. [10/28/2019 08:55:16.98] Debug - Ssh: Using 2048-bit Diffie-Hellman prime (minimum allowed size is 1024 bits). [10/28/2019 08:55:16.98] Verbose - Ssh: Sending packet SSH_MSG_KEX_30 (261 bytes). 0000 |1E-00-00-01-00-69-81-49 20-C8-D9-C5-C6-20-48-10| .....i.I .... H. 0010 |AA-8F-B4-54-F7-39-2C-09 E1-EE-4C-FD-06-1E-7B-D7| ...T.9,...L...{. 0020 |41-91-BE-37-A7-CB-85-69 59-2B-1B-89-BE-C9-90-F6| A..7...iY ...... 0030 |E6-99-7C-54-A7-DC-12-79 7E-01-6D-37-90-8B-50-B8| ..|T...y~.m7..P. 0040 |D5-5D-70-FC-95-80-46-8F 07-BD-A7-C8-74-BA-EE-18| .]p...F.....t... 0050 |C5-30-5F-C3-13-47-A2-6D C2-20-E3-4C-B7-49-71-FF| .0_..G.m. .L.Iq. 0060 |5F-55-F3-96-D8-BA-52-0E 69-E3-59-B5-E7-04-72-2B| _U....R.i.Y...r 0070 |BF-B6-53-69-78-FC-10-A1 06-15-EE-09-02-44-89-35| ..Six........D.5 0080 |44-A8-99-6F-EA-B6-BC-93 3A-EB-2F-95-87-75-E2-F6| D..o....:./..u.. 0090 |76-43-DE-05-00-90-5B-FF 59-2B-CD-3A-2E-64-3F-06| vC....[.Y .:.d?. 00A0 |12-B6-9A-5A-B9-85-ED-D8 BF-F8-64-7F-89-A6-B9-50| ...Z......d....P 00B0 |20-AF-61-8D-47-90-7D-48 40-44-5A-14-4F-3D-C9-93| .a.G.}H@DZ.O=.. 00C0 |50-CE-71-B7-87-1D-0D-A1 C7-9E-B9-30-56-1C-16-5F| P.q........0V.._ 00D0 |12-0B-BB-38-7E-FD-53-DE FB-3A-C1-49-7B-78-EE-5F| ...8~.S..:.I{x._ 00E0 |C4-B8-12-C7-AE-03-D5-0A 18-D0-59-83-22-BD-6F-E4| ..........Y.".o. 00F0 |F6-B1-53-D1-CB-E8-74-A5 55-46-81-59-4C-B4-F9-1E| ..S...t.UF.YL... 0100 |C8-78-DC-83-C9 | .x... [10/28/2019 08:55:17.05] Verbose - Ssh: Received packet SSH_MSG_KEX_31 (820 bytes). 0000 |1F-00-00-01-17-00-00-00 07-73-73-68-2D-72-73-61| .........ssh-rsa 0010 |00-00-00-03-01-00-01-00 00-01-01-00-F9-66-82-06| .............f.. 0020 |65-93-EF-3D-A2-4B-42-6E 6A-05-04-47-DC-DC-18-35| e..=.KBnj..G...5 0030 |3E-10-02-33-9E-0A-F5-B1 83-62-2E-28-4C-8A-39-83| >..3.....b.(L.9. 0040 |3B-03-76-49-A6-A2-1E-4C 46-84-9D-EE-27-68-42-C6| ;.vI...LF...'hB. 0050 |1B-FE-9F-EB-E4-33-B1-DB 66-18-53-62-F1-B3-21-1A| .....3..f.Sb..!. 0060 |87-87-A4-19-ED-6F-BD-CD 3E-55-88-30-11-9B-42-AE| .....o..>U.0..B. 0070 |60-B3-F7-DB-D9-23-D0-56 D5-82-5A-80-7D-33-02-FC| `....#.V..Z.}3.. 0080 |34-CE-22-42-4E-6F-D0-5C 06-EE-0F-E6-3B-35-90-92| 4."BNo.\....;5.. 0090 |5D-E5-50-79-40-92-A9-CE F5-E8-A5-8C-C1-3C-10-0F| ].Py@........<.. 00A0 |CF-6A-A9-79-D3-3E-65-9D DE-E8-86-0C-35-E7-D1-C8| .j.y.>e.....5... 00B0 |64-A0-74-C1-96-0E-4E-42 51-87-8A-7F-60-A8-BD-7D| d.t...NBQ...`..} 00C0 |53-B9-69-32-44-EC-B9-D5 85-15-34-DA-51-A0-E9-60| S.i2D.....4.Q..` 00D0 |C5-C9-CD-F3-25-69-ED-CB AB-72-32-DB-A3-4C-C3-FA| ....%i...r2..L.. 00E0 |93-B3-7B-C8-67-E7-75-22 39-22-13-C6-B3-31-4B-7B| ..{.g.u"9"...1K{ 00F0 |DC-55-B9-A5-75-BE-B2-F7 B6-6F-89-38-01-5C-F2-49| .U..u....o.8.\.I 0100 |14-C3-AF-AF-16-A8-F6-0F 4E-02-93-41-F9-8A-7F-4D| ........N..A...M 0110 |C8-6B-81-37-F2-3D-A2-0D 0D-AF-3D-7D-00-00-01-01| .k.7.=....=}.... 0120 |00-B2-8A-DE-CE-EA-24-98 D0-55-B2-4F-60-66-AC-8E| ......$..U.O`f.. 0130 |89-39-80-56-C5-3D-5D-AD BD-77-BD-A8-17-D2-EA-00| .9.V.=]..w...... 0140 |95-36-69-09-C5-76-E4-A6 F3-ED-6D-0E-CB-F9-F6-4E| .6i..v....m....N 0150 |9B-78-5E-BC-CC-0B-F1-2C FC-C6-81-2B-B2-74-EF-F2| .x^....,... .t.. 0160 |76-C7-62-3F-1A-52-8D-E6 CE-FE-BE-D0-7F-BE-08-23| v.b?.R.........# 0170 |EE-C0-FC-ED-72-9B-09-AC 7F-24-66-CC-FA-CF-77-DC| ....r....$f...w. 0180 |6F-8C-7F-88-BE-3C-6C-6E 3A-7F-7D-BF-BD-38-D7-E9| o....
 
asked 10/28/2019 1:03:09 PM
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