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https://issues.apache.org/jira/browse/DIRMINA-1143?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17354369#comment-17354369
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Frits Jalvingh commented on DIRMINA-1143:
-----------------------------------------
I forgot: the corresponding dump from within the mina code is this:
{{>> BAD IDENT:}}
{{0000: 00 00 01 d4 0b 14 3c 78 19 50 32 fb ca 7e bc 6d ......<x.P2..~.m}}
{{0010: 98 57 a9 6d de 5e 00 00 00 47 64 69 66 66 69 65 .W.m.^...Gdiffie}}
{{0020: 2d 68 65 6c 6c 6d 61 6e 2d 67 72 6f 75 70 2d 65 -hellman-group-e}}
{{0030: 78 63 68 61 6e 67 65 2d 73 68 61 32 35 36 2c 64 xchange-sha256,d}}
{{0040: 69 66 66 69 65 2d 68 65 6c 6c 6d 61 6e 2d 67 72 iffie-hellman-gr}}
{{0050: 6f 75 70 2d 65 78 63 68 61 6e 67 65 2d 73 68 61 oup-exchange-sha}}
{{0060: 31 00 00 00 0f 73 73 68 2d 72 73 61 2c 73 73 68 1....ssh-rsa,ssh}}
{{0070: 2d 64 73 73 00 00 00 41 61 65 73 31 32 38 2d 63 -dss...Aaes128-c}}
{{0080: 74 72 2c 61 65 73 31 39 32 2d 63 74 72 2c 61 65 tr,aes192-ctr,ae}}
{{0090: 73 32 35 36 2d 63 74 72 2c 61 65 73 31 32 38 2d s256-ctr,aes128-}}
{{00a0: 63 62 63 2c 61 65 73 31 39 32 2d 63 62 63 2c 61 cbc,aes192-cbc,a}}
{{00b0: 65 73 32 35 36 2d 63 62 63 00 00 00 41 61 65 73 es256-cbc...Aaes}}
{{00c0: 31 32 38 2d 63 74 72 2c 61 65 73 31 39 32 2d 63 128-ctr,aes192-c}}
{{00d0: 74 72 2c 61 65 73 32 35 36 2d 63 74 72 2c 61 65 tr,aes256-ctr,ae}}
{{00e0: 73 31 32 38 2d 63 62 63 2c 61 65 73 31 39 32 2d s128-cbc,aes192-}}
{{00f0: 63 62 63 2c 61 65 73 32 35 36 2d 63 62 63 00 00 cbc,aes256-cbc..}}
{{which is somewhere in the start of the key exchange packet.}}
> sftp authentication fails with "Incorrect identification (null characters not
> allowed) - at line 1 character #1 after ''
> ------------------------------------------------------------------------------------------------------------------------
>
> Key: DIRMINA-1143
> URL: https://issues.apache.org/jira/browse/DIRMINA-1143
> Project: MINA
> Issue Type: Bug
> Components: Core
> Environment: Ubuntu Linux 18.04, Java 11.
> Reporter: Frits Jalvingh
> Priority: Major
> Attachments: packetlog2.cat
>
>
> I am having this intermittent error when authenticating to an sftp server. It
> is always the same server and always the same program; connecting fails about
> once every 5 times with this error coming from SessionHelper.java, method
> doReadIdentification. I had this error before and upgraded to Mina 2.6.0 from
> maven (org.apache.sshd, sshd-core et al) but that changed nothing. The code
> runs on Ubuntu Linux 18.04 (Azure, sigh) with Java 11.I tried to do some
> debugging and for that I changed SessionHelper so that it dumps the
> information that it is trying to read at that time from its buffer. Because
> that always died with that NUL character as the first character read I made
> the code continue to read a bit so that there might be some context.. What is
> present in that buffer at this time is this:
>
> {{0000: 00 00 01 d4 0b 14 8a e8 5f 65 22 7b 97 4f 2d 61 ........_e"{.O-a}}
> {{0010: 12 75 19 81 6e 1a 00 00 00 47 64 69 66 66 69 65 .u..n....Gdiffie}}
> {{0020: 2d 68 65 6c 6c 6d 61 6e 2d 67 72 6f 75 70 2d 65 -hellman-group-e}}
> {{0030: 78 63 68 61 6e 67 65 2d 73 68 61 32 35 36 2c 64 xchange-sha256,d}}
> {{0040: 69 66 66 69 65 2d 68 65 6c 6c 6d 61 6e 2d 67 72 iffie-hellman-gr}}
> {{0050: 6f 75 70 2d 65 78 63 68 61 6e 67 65 2d 73 68 61 oup-exchange-sha}}
> {{0060: 31 00 00 00 0f 73 73 68 2d 72 73 61 2c 73 73 68 1....ssh-rsa,ssh}}
> {{0070: 2d 64 73 73 00 00 00 41 61 65 73 31 32 38 2d 63 -dss...Aaes128-c}}
> {{0080: 74 72 2c 61 65 73 31 39 32 2d 63 74 72 2c 61 65 tr,aes192-ctr,ae}}
> {{0090: 73 32 35 36 2d 63 74 72 2c 61 65 73 31 32 38 2d s256-ctr,aes128-}}
> {{00a0: 63 62 63 2c 61 65 73 31 39 32 2d 63 62 63 2c 61 cbc,aes192-cbc,a}}
> {{00b0: 65 73 32 35 36 2d 63 62 63 00 00 00 41 61 65 73 es256-cbc...Aaes}}
> {{00c0: 31 32 38 2d 63 74 72 2c 61 65 73 31 39 32 2d 63 128-ctr,aes192-c}}
> {{00d0: 74 72 2c 61 65 73 32 35 36 2d 63 74 72 2c 61 65 tr,aes256-ctr,ae}}
> {{00e0: 73 31 32 38 2d 63 62 63 2c 61 65 73 31 39 32 2d s128-cbc,aes192-}}
> {{00f0: 63 62 63 2c 61 65 73 32 35 36 2d 63 62 63 00 cbc,aes256-cbc.}}
>
> The error occurs when reading that 00 at offset 0000; the rest of the data is
> there by looking into the rest of that buffer..
> I can quite easily reproduce this, so if more data is needed I should be able
> to provide it..
>
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