FTP Demo with CompleteFTP

[JPeterMugaas]

I'm having trouble using CompleteTPD with the Console FTP Demo when using an OpenSSL version greater than 3.0. CompleteFTP's website is: https://enterprisedt.com/products/completeftp/ . Funny enough, I can use the Console FTP Demo with OpenSSL 1..1.1w but that version series of OpenSSL has reached its end of life so I don't like it.

Here's what I got from Wireshark ("Summary" followed by "Bytes as Hex and ASCII Dump").

854	26.748172	127.0.0.1	127.0.0.1	TLSv1	1584	Client Hello (SNI=localhost)
0000   02 00 00 00 45 00 06 2c e2 aa 40 00 80 06 00 00   ....E..,..@.....
0010   7f 00 00 01 7f 00 00 01 c0 74 00 15 3a c4 5f be   .........t..:._.
0020   09 c7 be 07 50 18 00 ff 9a 8c 00 00 16 03 01 05   ....P...........
0030   ff 01 00 05 fb 03 03 b2 68 9d 71 f2 69 76 ea 2a   ........h.q.iv.*
0040   98 5b 0c e4 b4 00 68 20 c1 4d b5 be 25 3a b9 79   .[....h .M..%:.y
0050   8a 02 ac 72 1f ab 8c 20 bf 57 36 7d 2a d4 f3 12   ...r... .W6}*...
0060   2b 96 e4 27 72 95 15 f8 b6 46 22 5c 75 a1 36 20   +..'r....F"\u.6 
0070   ce 0d f4 ed fd 00 fa 03 00 3c 13 02 13 03 13 01   .........<......
0080   c0 2c c0 30 00 9f cc a9 cc a8 cc aa c0 2b c0 2f   .,.0.........+./
0090   00 9e c0 24 c0 28 00 6b c0 23 c0 27 00 67 c0 0a   ...$.(.k.#.'.g..
00a0   c0 14 00 39 c0 09 c0 13 00 33 00 9d 00 9c 00 3d   ...9.....3.....=
00b0   00 3c 00 35 00 2f 01 00 05 76 ff 01 00 01 00 00   .<.5./...v......
00c0   00 00 0e 00 0c 00 00 09 6c 6f 63 61 6c 68 6f 73   ........localhos
00d0   74 00 0b 00 02 01 00 00 0a 00 12 00 10 11 ec 00   t...............
00e0   1d 00 17 00 1e 00 18 00 19 01 00 01 01 00 23 00   ..............#.
00f0   00 00 16 00 00 00 17 00 00 00 0d 00 36 00 34 09   ............6.4.
0100   05 09 06 09 04 04 03 05 03 06 03 08 07 08 08 08   ................
0110   1a 08 1b 08 1c 08 09 08 0a 08 0b 08 04 08 05 08   ................
0120   06 04 01 05 01 06 01 03 03 03 01 03 02 04 02 05   ................
0130   02 06 02 00 2b 00 05 04 03 04 03 03 00 2d 00 02   ....+........-..
0140   01 01 00 33 04 ea 04 e8 11 ec 04 c0 e9 c8 3b 77   ...3..........;w
0150   b5 95 aa 32 87 a5 55 53 10 a2 ba 1e 39 2f 6c ca   ...2..US....9/l.
0160   95 18 40 62 4c 79 6c 92 37 3a 3e d6 34 84 a4 36   ..@bLyl.7:>.4..6
0170   b9 70 01 21 f1 2b 79 7b 04 97 7c ac bf 0a 22 90   .p.!.+y{..|...".
0180   15 68 31 f6 c8 54 cc 84 1b b7 80 c8 b6 1c bd 52   .h1..T.........R
0190   90 1c 01 92 9e ac 9d 77 91 6f d8 82 0e dd d2 9f   .......w.o......
01a0   15 28 45 78 06 a6 da 11 5a ae b6 0f d8 b5 22 5b   .(Ex....Z....."[
01b0   e9 98 e8 aa 83 7e 24 ae 4c a3 42 b2 77 76 af e8   .....~$.L.B.wv..
01c0   0f 33 44 9e 3d 98 bc e1 72 ad 2a fb 91 88 db 9d   .3D.=...r.*.....
01d0   36 89 1f b5 27 73 bf 42 1e 1d d2 99 fe 4c 8e 1d   6...'s.B.....L..
01e0   5b a6 89 97 ad d7 25 06 39 57 0b ef 4a a5 5c 44   [.....%.9W..J.\D
01f0   20 7a 35 58 f6 6b 00 d7 83 9a c8 b7 9c 76 e9 09    z5X.k.......v..
0200   f8 21 4c 72 72 52 a5 a9 6e 13 73 56 43 db 9f 3f   .!LrrR..n.sVC..?
0210   7c bb 9a ba 5e c4 66 8c 4f a9 71 f9 e4 92 13 96   |...^.f.O.q.....
0220   2a fc 27 10 f2 d9 02 72 0b 6b 54 96 c0 a3 16 c4   *.'....r.kT.....
0230   c7 45 42 cf a2 06 1a 51 ca 30 e3 35 c0 b5 af 10   .EB....Q.0.5....
0240   46 25 e5 29 1c d7 f3 4d 88 ba 58 52 17 0a 16 bc   F%.)...M..XR....
0250   b9 c3 06 66 1c c2 80 80 82 5e 2d d6 85 87 ab 4a   ...f.....^-....J
0260   d4 23 c1 96 99 73 67 48 c4 f5 e1 3e 50 0c 76 2b   .#...sgH...>P.v+
0270   01 2a 79 70 c6 cd 92 bc 2e d2 60 79 35 7d 46 94   .*yp......`y5}F.
0280   33 51 b6 98 e9 62 4f 37 f6 7c 39 67 33 d7 b3 64   3Q...bO7.|9g3..d
0290   fd 23 c2 73 4c b0 56 51 9a ee dc 6d 43 fb 81 e3   .#.sL.VQ...mC...
02a0   6a 4e f3 b6 02 82 42 0a 02 15 04 ca 9b 22 68 07   jN....B......"h.
02b0   82 72 5a a7 fa ea ba d0 1c 6a a4 28 34 7d 6a 86   .rZ......j.(4}j.
02c0   b2 36 3a ce 16 07 31 0c 3a 91 86 5d 1d 56 42 8d   .6:...1.:..].VB.
02d0   81 34 83 e7 5e 86 a9 49 f4 40 31 f8 0a 01 4a f9   .4..^..I.@1...J.
02e0   b9 63 c0 a3 5a 81 5c 7d 72 8e c9 d1 a7 22 2b 9b   .c..Z.\}r...."+.
02f0   df d0 1d ad 38 1c 8d 51 1e d6 40 19 7f 65 4c 9d   ....8..Q..@..eL.
0300   1a 5f 42 50 84 ac f0 c8 62 db 40 d6 86 2a 54 64   ._BP....b.@..*Td
0310   15 2c a5 5a 22 07 1d 19 4a 25 d0 1c 6e 14 83 7f   .,.Z"...J%..n...
0320   e0 22 65 97 c1 c8 27 28 8a d6 95 12 9f 9b 95 aa   ."e...'(........
0330   d6 21 14 6c 97 41 69 4c 5a 56 42 11 1b c6 e8 70   .!.l.AiLZVB....p
0340   0f 7c 78 2a 11 fa c6 49 eb 54 a1 04 49 e8 ac 3b   .|x*...I.T..I..;
0350   8a 8a c3 59 70 36 e2 29 35 94 a3 ac 3c f9 8f c6   ...Yp6.)5...<...
0360   c5 37 76 27 56 4c c6 17 ed 5b 5f af 46 77 ca c7   .7v'VL...[_.Fw..
0370   07 6c 1a b5 cd 55 b0 82 54 01 fb 72 3a b8 ea 87   .l...U..T..r:...
0380   9e 8a 37 99 92 a1 4e 10 b4 30 23 62 76 18 2d 77   ..7...N..0#bv.-w
0390   04 77 1f 28 23 2e a1 44 39 63 8b 03 19 ab cb 46   .w.(#..D9c.....F
03a0   91 b4 4c 72 31 41 c2 38 79 88 54 33 6a f1 29 a9   ..Lr1A.8y.T3j.).
03b0   5f 59 1c 7a d1 75 e5 58 27 ce 52 1c 86 26 54 98   _Y.z.u.X'.R..&T.
03c0   eb ce 0c 71 25 50 87 48 e0 75 a2 a1 38 52 c8 d7   ...q%P.H.u..8R..
03d0   08 11 ab 78 02 96 b6 51 90 28 17 75 9e 16 b2 71   ...x...Q.(.u...q
03e0   13 5c c5 47 97 74 91 37 5d b7 61 23 85 a2 17 98   .\.G.t.7].a#....
03f0   09 07 bd 40 25 48 bc a9 b0 c7 11 47 c2 47 00 a7   ...@%H.....G.G..
0400   48 f8 80 0d c8 82 be 6b 61 28 3c cb 6c a2 f9 5f   H......ka(<.l.._
0410   b3 02 a4 58 96 49 0e 99 bf f3 29 b3 63 b6 1d 0d   ...X.I....).c...
0420   23 41 d8 28 54 0f 95 5a 72 82 50 2a 70 ad 65 2a   #A.(T..Zr.P*p.e*
0430   08 31 99 4a 8f 31 14 22 14 00 1f 5a 46 5e 49 bb   .1.J.1."...ZF^I.
0440   14 6a 45 2b c4 51 0e d5 54 13 01 52 61 23 c8 3b   .jE+.Q..T..Ra#.;
0450   e6 a7 7e d2 b7 91 48 c8 81 9a 22 26 62 7f cc 39   ..~...H..."&b..9
0460   b5 5e 15 26 ec d2 40 2c 72 36 ff ba 28 56 e1 1b   .^.&..@,r6..(V..
0470   b2 75 7b 7e 7a 65 d5 34 08 ea 58 bb 6b e8 0e ee   .u{~ze.4..X.k...
0480   45 4a 91 39 1b 58 08 b5 13 9b 8c e8 b6 24 36 b0   EJ.9.X.......$6.
0490   87 f4 76 49 7a b5 09 0d 02 32 ab 2b 8c 65 ac 1e   ..vIz....2.+.e..
04a0   27 ca 2f a7 27 85 8f 05 25 cf 05 8e 0d d5 47 e9   './.'...%.....G.
04b0   51 99 e8 b6 ae a7 a3 b8 47 d3 a4 18 71 50 56 42   Q.......G...qPVB
04c0   ca 55 6a af 6f 9a b2 1c b6 bd 53 75 ab 19 3a c1   .Uj.o.....Su..:.
04d0   e0 d5 cd cc 5b 3f e4 3b b9 47 34 7a fd 49 79 af   ....[?.;.G4z.Iy.
04e0   32 6d 88 26 3a b0 0b 01 fe 58 9c 8d f5 cd dc 96   2m.&:....X......
04f0   c6 0d 82 2b b3 d1 85 a4 18 4b 5f c9 a4 29 68 57   ...+.....K_..)hW
0500   ae e9 61 7d 1b 03 ec 10 cb 4e 53 6e aa 27 79 50   ..a}.....NSn.'yP
0510   b2 5f c7 d2 40 86 68 cb 8d a4 29 4b d9 71 5a c4   ._..@.h...)K.qZ.
0520   4e 5a 34 b8 37 e3 9a 3a c5 0a 2e 49 c0 fd 20 36   NZ4.7..:...I.. 6
0530   84 ea 71 cb 27 bf 44 01 8c 52 a5 5b 39 83 48 d8   ..q.'.D..R.[9.H.
0540   87 a0 a2 c7 55 9b f1 a7 bb 9c 6d 2f 03 b8 93 17   ....U.....m/....
0550   1c 37 81 ad 01 30 5c 16 61 bf 10 c0 66 37 70 91   .7...0\.a...f7p.
0560   4c 49 03 b7 e2 9d 1b d9 2d dd bc 75 e8 54 10 ed   LI......-..u.T..
0570   fa 6a 0a 04 29 a3 b0 06 b4 83 18 0c c9 55 34 da   .j..)........U4.
0580   b3 47 da 6c 33 a4 43 61 15 25 f7 59 98 6f ca 8f   .G.l3.Ca.%.Y.o..
0590   1a 05 2c 13 53 b5 a1 d7 bd 73 da 44 65 3b 87 de   ..,.S....s.De;..
05a0   87 10 2f 35 80 08 60 c9 60 f0 2c 45 14 77 30 a9   ../5..`.`.,E.w0.
05b0   68 b5 c1 a0 64 b3 5d 93 55 4c 0a 39 5a 77 f3 b2   h...d.].UL.9Zw..
05c0   79 02 a7 0e e0 9e 1f 0b 30 e3 b4 a3 d1 01 7e 2c   y.......0.....~,
05d0   67 43 5d 52 c3 86 58 5a e0 59 31 87 c1 52 6d e5   gC]R..XZ.Y1..Rm.
05e0   9e ba 41 b1 99 b9 98 0b 16 7d 15 24 24 be 59 df   ..A......}.$$.Y.
05f0   f9 08 7b 6a 5d 27 9b 2f bd cd df 98 8b ad dd d6   ..{j]'./........
0600   40 80 c8 e1 2c 15 51 e0 95 2e dd 64 00 1d 00 20   @...,.Q....d... 
0610   64 b9 d0 64 cc bd 38 43 dc 40 fd 2b 42 c9 57 45   d..d..8C.@.+B.WE
0620   69 46 b8 a6 eb 64 89 19 fb b3 b3 94 52 97 0b 54   iF...d......R..T

855	26.748195	127.0.0.1	127.0.0.1	TCP	44	21 → 49268 [ACK] Seq=123 Ack=1567 Win=63744 Len=0
0000   02 00 00 00 45 00 00 28 e2 ab 40 00 80 06 00 00   ....E..(..@.....
0010   7f 00 00 01 7f 00 00 01 00 15 c0 74 09 c7 be 07   ...........t....
0020   3a c4 65 c2 50 10 00 f9 87 fa 00 00               :.e.P.......

856	26.759718	127.0.0.1	127.0.0.1	TCP	44	21 → 49268 [FIN, ACK] Seq=123 Ack=1567 Win=63744 Len=0
0000   02 00 00 00 45 00 00 28 e2 ac 40 00 80 06 00 00   ....E..(..@.....
0010   7f 00 00 01 7f 00 00 01 00 15 c0 74 09 c7 be 07   ...........t....
0020   3a c4 65 c2 50 11 00 f9 87 f9 00 00               :.e.P.......

857	26.759743	127.0.0.1	127.0.0.1	TCP	44	49268 → 21 [ACK] Seq=1567 Ack=124 Win=65280 Len=0

0000   02 00 00 00 45 00 00 28 e2 ad 40 00 80 06 00 00   ....E..(..@.....
0010   7f 00 00 01 7f 00 00 01 c0 74 00 15 3a c4 65 c2   .........t..:.e.
0020   09 c7 be 08 50 10 00 ff 87 f3 00 00               ....P.......

858	26.759795	127.0.0.1	127.0.0.1	TLSv1	51	Alert (Level: Fatal, Description: Decode Error)
0000   02 00 00 00 45 00 00 2f e2 ae 40 00 80 06 00 00   ....E../..@.....
0010   7f 00 00 01 7f 00 00 01 c0 74 00 15 3a c4 65 c2   .........t..:.e.
0020   09 c7 be 08 50 18 00 ff 3d df 00 00 15 03 01 00   ....P...=.......
0030   02 02 32        

[JPeterMugaas]

The Wireshark .pcapng file:
tlserror-completeftp.zip

[JPeterMugaas]

Just in case it helps, here's the Wireshark .pcapng for the program using OpenSSL 1.1.1w. It successfully works in that case.

tlserror-completeftp-openssl-1-1-1w.zip

I have had success using WS-FTP and SmartFTP.

[JPeterMugaas]

Verified works with OpenSSL 3.0.18, 3.1.8, 3.2.3, 3.3.2, and 3.4.3. Fails with 3.5.4 and 3.6.0. So what's the key difference here?

[JPeterMugaas]

Packet sniff of demo program using OpenSSL 3.4.3. This works
tlserror-completeftp-openssl-3-4-3.zip

Hopefully, this helps fix the issue with OpenSSL 3.5.0.

[tregubovav-dev]

I have enabled debug log for CompleteFTP server and found the exception when Console FTP Demo Client tries to connect with the OpenSSL 3.5.3: Org.BouncyCastle.Tls.TlsFatalAlert: internal_error(80) ---> System.ArgumentException: invalid CryptoHashAlgorithm: -1

@JPeterMugaas , can you please check you see the same error?

Here is an CompleteFTP log in my environment:

025-10-26 17:33:48,409 DEBUG SocketListener [Session.2:Default Site:user?] Accepted connection (PR=trial - 11/26/2025) 
2025-10-26 17:33:48,409 DEBUG SocketListener [Session.2:Default Site:user?] BeginAccept (port 990) 
2025-10-26 17:33:48,409 DEBUG SocketListener [Session.2:Default Site.990:user?:127.0.0.1] Allowed connection on port 990 from 127.0.0.1 due to rule Inbuilt - always allow local 
2025-10-26 17:33:48,409 DEBUG SocketListener [Session.2:Default Site.990:user?:127.0.0.1] Auto-banning disabled for 127.0.0.1 due to rule Inbuilt - always allow local 
2025-10-26 17:33:48,410 DEBUG FTPConfiguration [Session.2:Default Site.990:user?:127.0.0.1] Using UTF8 encoding 
2025-10-26 17:33:48,412 DEBUG processUser [Session.2:Default Site.990:user?:127.0.0.1] Process user remaining as NT AUTHORITY\SYSTEM 
2025-10-26 17:33:48,414 DEBUG CertificateStore [Session.2:Default Site.990:user?:127.0.0.1] Valid PFX file 
2025-10-26 17:33:48,416 DEBUG CertificateStore [Session.2:Default Site.990:user?:127.0.0.1] Password valid - calling PFXImportCertStore 
2025-10-26 17:33:48,444 DEBUG CertificateStore [Session.2:Default Site.990:user?:127.0.0.1] Successfully imported the PFX file 
2025-10-26 17:33:48,446 DEBUG SecureConfiguration [Session.2:Default Site.990:user?:127.0.0.1] 1 certificates 
2025-10-26 17:33:48,456 DEBUG SecureSocket [Session.2:Default Site.990:user?:127.0.0.1] ChangeSecurityProtocol: Tls1, Tls11, Tls12, Tls13 
2025-10-26 17:33:48,459 DEBUG SecureSocket [Session.2:Default Site.990:user?:127.0.0.1] Starting handshake 
2025-10-26 17:33:48,459 DEBUG SocketController [Session.2:Default Site.990:user?:127.0.0.1] Starting TLS server 
2025-10-26 17:33:48,465 DEBUG EdtTlsServer [Session.2:Default Site.990:user?:127.0.0.1] Couldn't add support for the the 's' attribute to X509Name. 
System.NullReferenceException: Object reference not set to an instance of an object.
   at EOoOEnvHwPFgUVWgrSAp.kjM5JvvHQGmOyqVbR2wO..cctor()
2025-10-26 17:33:48,473 DEBUG EdtTlsServer [Session.2:Default Site.990:user?:127.0.0.1] Supported server versions: TLS 1.0, TLS 1.1, TLS 1.2, TLS 1.3 
2025-10-26 17:33:48,479 DEBUG EdtTlsServer [Session.2:Default Site.990:user?:127.0.0.1] Server cipher suites: TLS_AES_128_GCM_SHA256,TLS_AES_256_GCM_SHA384,TLS_CHACHA20_POLY1305_SHA256,TLS_RSA_WITH_AES_128_GCM_SHA256,TLS_RSA_WITH_AES_256_GCM_SHA384,TLS_DHE_RSA_WITH_AES_128_GCM_SHA256,TLS_DHE_RSA_WITH_AES_256_GCM_SHA384,TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256,TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384,TLS_DHE_RSA_WITH_AES_128_CBC_SHA256,TLS_DHE_RSA_WITH_AES_256_CBC_SHA256,TLS_RSA_WITH_AES_128_CBC_SHA256,TLS_RSA_WITH_AES_256_CBC_SHA256 
2025-10-26 17:33:48,481 DEBUG SecureSocket [Session.2:Default Site.990:user?:127.0.0.1] Handshake started 
2025-10-26 17:33:48,481 DEBUG SecureSocket [Session.2:Default Site.990:user?:127.0.0.1] Waiting for handshake completion 
2025-10-26 17:33:48,481 DEBUG SecureSocket [Session.2:Default Site.990:user?:127.0.0.1] Waiting for handshake to complete (timeout=60000ms) 
2025-10-26 17:33:48,496 DEBUG EdtTlsServer [Session.2:Default Site.990:user?:127.0.0.1] Client version: TLS 1.3 
2025-10-26 17:33:48,496 DEBUG EdtTlsServer [Session.2:Default Site.990:user?:127.0.0.1] Offered client cipher suites: TLS_AES_256_GCM_SHA384,TLS_CHACHA20_POLY1305_SHA256,TLS_AES_128_GCM_SHA256,TLS_ECDHE_ECDSA_WITH_AES_256_GCM_SHA384,TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384,TLS_DHE_RSA_WITH_AES_256_GCM_SHA384,TLS_ECDHE_ECDSA_WITH_CHACHA20_POLY1305_SHA256,TLS_ECDHE_RSA_WITH_CHACHA20_POLY1305_SHA256,TLS_DHE_RSA_WITH_CHACHA20_POLY1305_SHA256,TLS_ECDHE_ECDSA_WITH_AES_128_GCM_SHA256,TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256,TLS_DHE_RSA_WITH_AES_128_GCM_SHA256,TLS_ECDHE_ECDSA_WITH_AES_256_CBC_SHA384,TLS_ECDHE_RSA_WITH_AES_256_CBC_SHA384,TLS_DHE_RSA_WITH_AES_256_CBC_SHA256,TLS_ECDHE_ECDSA_WITH_AES_128_CBC_SHA256,TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA256,TLS_DHE_RSA_WITH_AES_128_CBC_SHA256,TLS_ECDHE_ECDSA_WITH_AES_256_CBC_SHA,TLS_ECDHE_RSA_WITH_AES_256_CBC_SHA,TLS_DHE_RSA_WITH_AES_256_CBC_SHA,TLS_ECDHE_ECDSA_WITH_AES_128_CBC_SHA,TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA,TLS_DHE_RSA_WITH_AES_128_CBC_SHA,TLS_RSA_WITH_AES_256_GCM_SHA384,TLS_RSA_WITH_AES_128_GCM_SHA256,TLS_RSA_WITH_AES_256_CBC_SHA256,TLS_RSA_WITH_AES_128_CBC_SHA256,TLS_RSA_WITH_AES_256_CBC_SHA,TLS_RSA_WITH_AES_128_CBC_SHA 
2025-10-26 17:33:48,496 DEBUG EdtTlsServer [Session.2:Default Site.990:user?:127.0.0.1] TLS server negotiated TLS 1.3 
2025-10-26 17:33:48,540 DEBUG EdtTlsServer [Session.2:Default Site.990:user?:127.0.0.1] GetCertificateRequest() 
2025-10-26 17:33:48,592 ERROR SocketController [Session.2:Default Site.990:user?:127.0.0.1] OnReceive - caught exception - closing 
Org.BouncyCastle.Tls.TlsFatalAlert: internal_error(80) ---> System.ArgumentException: invalid CryptoHashAlgorithm: -1
   at Org.BouncyCastle.Tls.Crypto.Impl.BC.BcTlsCrypto.CreateDigest(Int32 cryptoHashAlgorithm)
   at Org.BouncyCastle.Tls.Crypto.Impl.BC.BcTlsCrypto.CreateHash(Int32 cryptoHashAlgorithm)
   at Org.BouncyCastle.Tls.TlsUtilities.S2v4IP4bgV9(TlsCrypto  , TlsCredentialedSigner  , String  , TlsHandshakeHash  , SignatureAndHashAlgorithm  )
   at Org.BouncyCastle.Tls.TlsUtilities.lvX4Ivank5r(TlsContext  , TlsCredentialedSigner  , TlsHandshakeHash  )
   at Org.BouncyCastle.Tls.TlsServerProtocol.Send13ServerHelloCoda(ServerHello serverHello, Boolean afterHelloRetryRequest)
   at Org.BouncyCastle.Tls.TlsProtocol.whf4XVMlIYf(ByteQueue  )
   at Org.BouncyCastle.Tls.TlsProtocol.O3C4XN71q1F(Int16  , Byte[]  , Int32  , Int32  )
   at aPWwlZ4jzT6G7bYmkgny.bQRYZQ4jOV0wqmf8FPcp.IJ44sK4sPLQ(Byte[]  , Int32  , Int32  )
   at Org.BouncyCastle.Tls.TlsProtocol.SafeReadFullRecord(Byte[] input, Int32 inputOff, Int32 inputLen)
   --- End of inner exception stack trace ---
   at Org.BouncyCastle.Tls.TlsProtocol.SafeReadFullRecord(Byte[] input, Int32 inputOff, Int32 inputLen)
   at Org.BouncyCastle.Tls.TlsProtocol.OfferInput(Byte[] input, Int32 inputOff, Int32 inputLen)
   at e9uXt2vHT2LW2hrbeSid.mqbNpKvHpqXhxXocXnyl.BNSvH0BZhkJ(IAsyncResult  )
2025-10-26 17:33:48,594 DEBUG SocketController [Session.2:Default Site.990:user?:127.0.0.1] CloseConnection(e=internal_error(80)) 
2025-10-26 17:33:48,594 DEBUG SocketController [Session.2:Default Site.990:user?:127.0.0.1] Shut down socket 
2025-10-26 17:33:48,594 DEBUG SocketController [Session.2:Default Site.990:user?:127.0.0.1] Closed socket 
2025-10-26 17:33:48,594 DEBUG TransferBuffer [Session.2:Default Site.990:user?:127.0.0.1] Close() called when open 
2025-10-26 17:33:48,594 DEBUG SecureSocket [Session.2:Default Site.990:user?:127.0.0.1] OnHandshakeComplete(False,internal_error(80)) 
2025-10-26 17:33:48,594 DEBUG SecureSocket [Session.2:Default Site.990:user?:127.0.0.1] OnHandshakeComplete - waiting for lock 
2025-10-26 17:33:48,594 DEBUG SecureSocket [Session.2:Default Site.990:user?:127.0.0.1] OnHandshakeComplete - in lock 
2025-10-26 17:33:48,594 DEBUG SecureSocket [Session.2:Default Site.990:user?:127.0.0.1] OnHandshakeComplete - exiting lock 
2025-10-26 17:33:48,594 DEBUG SecureSocket [Session.2:Default Site.990:user?:127.0.0.1] OnHandshakeComplete - exit 
2025-10-26 17:33:48,596 ERROR SecureSocket [Session.2:Default Site.990:user?:127.0.0.1] Exception during handshake 
Org.BouncyCastle.Tls.TlsFatalAlert: internal_error(80) ---> System.ArgumentException: invalid CryptoHashAlgorithm: -1
   at Org.BouncyCastle.Tls.Crypto.Impl.BC.BcTlsCrypto.CreateDigest(Int32 cryptoHashAlgorithm)
   at Org.BouncyCastle.Tls.Crypto.Impl.BC.BcTlsCrypto.CreateHash(Int32 cryptoHashAlgorithm)
   at Org.BouncyCastle.Tls.TlsUtilities.S2v4IP4bgV9(TlsCrypto  , TlsCredentialedSigner  , String  , TlsHandshakeHash  , SignatureAndHashAlgorithm  )
   at Org.BouncyCastle.Tls.TlsUtilities.lvX4Ivank5r(TlsContext  , TlsCredentialedSigner  , TlsHandshakeHash  )
   at Org.BouncyCastle.Tls.TlsServerProtocol.Send13ServerHelloCoda(ServerHello serverHello, Boolean afterHelloRetryRequest)
   at Org.BouncyCastle.Tls.TlsProtocol.whf4XVMlIYf(ByteQueue  )
   at Org.BouncyCastle.Tls.TlsProtocol.O3C4XN71q1F(Int16  , Byte[]  , Int32  , Int32  )
   at aPWwlZ4jzT6G7bYmkgny.bQRYZQ4jOV0wqmf8FPcp.IJ44sK4sPLQ(Byte[]  , Int32  , Int32  )
   at Org.BouncyCastle.Tls.TlsProtocol.SafeReadFullRecord(Byte[] input, Int32 inputOff, Int32 inputLen)
   --- End of inner exception stack trace ---
   at Org.BouncyCastle.Tls.TlsProtocol.SafeReadFullRecord(Byte[] input, Int32 inputOff, Int32 inputLen)
   at Org.BouncyCastle.Tls.TlsProtocol.OfferInput(Byte[] input, Int32 inputOff, Int32 inputLen)
   at e9uXt2vHT2LW2hrbeSid.mqbNpKvHpqXhxXocXnyl.BNSvH0BZhkJ(IAsyncResult  )
2025-10-26 17:33:48,596 ERROR SocketListener [Session.2:Default Site.990:user?:127.0.0.1] OnConnected failed 
Org.BouncyCastle.Tls.TlsFatalAlert: internal_error(80) ---> System.ArgumentException: invalid CryptoHashAlgorithm: -1
   at Org.BouncyCastle.Tls.Crypto.Impl.BC.BcTlsCrypto.CreateDigest(Int32 cryptoHashAlgorithm)
   at Org.BouncyCastle.Tls.Crypto.Impl.BC.BcTlsCrypto.CreateHash(Int32 cryptoHashAlgorithm)
   at Org.BouncyCastle.Tls.TlsUtilities.S2v4IP4bgV9(TlsCrypto  , TlsCredentialedSigner  , String  , TlsHandshakeHash  , SignatureAndHashAlgorithm  )
   at Org.BouncyCastle.Tls.TlsUtilities.lvX4Ivank5r(TlsContext  , TlsCredentialedSigner  , TlsHandshakeHash  )
   at Org.BouncyCastle.Tls.TlsServerProtocol.Send13ServerHelloCoda(ServerHello serverHello, Boolean afterHelloRetryRequest)
   at Org.BouncyCastle.Tls.TlsProtocol.whf4XVMlIYf(ByteQueue  )
   at Org.BouncyCastle.Tls.TlsProtocol.O3C4XN71q1F(Int16  , Byte[]  , Int32  , Int32  )
   at aPWwlZ4jzT6G7bYmkgny.bQRYZQ4jOV0wqmf8FPcp.IJ44sK4sPLQ(Byte[]  , Int32  , Int32  )
   at Org.BouncyCastle.Tls.TlsProtocol.SafeReadFullRecord(Byte[] input, Int32 inputOff, Int32 inputLen)
   --- End of inner exception stack trace ---
   at vo9bSUvozjxGK3ZmYw1K.zRAkZevoOfjiPq2NF3Z0.NKSv84mwG09(fYZs0Uv8EnDJlmwrmmSw  )
   at i69ikMaoaVCM2SVA0AAm.c4TfwTaoPg8sWiKU5Drj..ctor(Site  , HZcShxPHYoj2MgHm1VBo  , Socket  , Boolean  , ILogTag  )
   at DHk90UPHIFqguJ8jylCY.PLMnWdPHuk0pQ4mD37Ut.mdUL4K7DTyl(Site  , Socket  , Boolean  , ILogTag  )
   at nZE1H5PlZmqpCB1oHQVB.HEC5cvPlU3f04HaIS67o.OnConnected(Socket socket, Boolean isAutoBanEnabled, ILogTag logTag)
   at eoJfKCP0exIC9jAOiEmZ.jW6uWlP0D4kEGU1BodRv.Bw6Lvq8Fo9o(IAsyncResult  )

[tregubovav-dev]

The openssl s_client -connect localhost:990 --showcerts command shows the same error as the Console FTP Demo Client and CompleteFTP server raises the same error.

[JPeterMugaas]

Also the OpenSSL itself displays the same error
openssl s_client -connect localhost:990 --servername localhost --showcerts
Connecting to 127.0.0.1
CONNECTED(000001AC)
F4420000:error:0A000126:SSL routines::unexpected eof while reading:ssl\record\rec_layer_s3.c:701:

[JPeterMugaas]

My confirmation:

C:\msys64\home\***\TaurusTLS\Demos\TaurusFTPConsole\Win64\Debug>openssl --version
OpenSSL 3.5.0 8 Apr 2025 (Library: OpenSSL 3.5.0 8 Apr 2025)

C:\msys64\home\****\TaurusTLS\Demos\TaurusFTPConsole\Win64\Debug>openssl s_client -connect localhost:990 --servername localhost --showcerts
Connecting to ::1
CONNECTED(000001B4)
E44C0000:error:0A000126:SSL routines::unexpected eof while reading:ssl/record/rec_layer_s3.c:691:
---
no peer certificate available
---
No client certificate CA names sent
Negotiated TLS1.3 group: <NULL>
---
SSL handshake has read 0 bytes and written 1549 bytes
Verification: OK
---
New, (NONE), Cipher is (NONE)
Protocol: TLSv1.3
This TLS version forbids renegotiation.
Compression: NONE
Expansion: NONE
No ALPN negotiated
Early data was not sent
Verify return code: 0 (ok)
---

[JPeterMugaas]

The CompleteFTP Vendor has been contacted about this issue.