[Info-vax] VMS SSH2 - tcpip$ssh_ssh-keygen2.exe (Couldn't agree on kex or hostkey alg)

[HCorte]

Trying to connect to another machine using ssh but failing with error of:

debug(24-MAY-2023 12:20:30.82): Remote version: SSH-2.0-OpenSSH_8.0
debug(24-MAY-2023 12:20:30.84): OpenSSH: Major: 8 Minor: 0 Revision: 0
debug(24-MAY-2023 12:20:30.84): Ssh2Transport/TRCOMMON.C:1825: All versions of OpenSSH handle kex guesses incorrectly.
debug(24-MAY-2023 12:20:30.84): Ssh2Transport/TRCOMMON.C:1113: Sending packet with type 2 to connection
debug(24-MAY-2023 12:20:30.84): Ssh2Transport/TRCOMMON.C:1113: Sending packet with type 20 to connection
debug(24-MAY-2023 12:20:30.84): Ssh2Transport/TRCOMMON.C:2756: >TR packet_type=20
debug(24-MAY-2023 12:20:30.84): Ssh2Transport/TRCOMMON.C:2318: lang s to c: `', lang c to s: `'
debug(24-MAY-2023 12:20:30.84): Ssh2Transport/TRCOMMON.C:2334: Couldn't agree on kex or hostkey alg. (chosen_kex = NULL, chosen_host
_key = ssh-rsa)
debug(24-MAY-2023 12:20:30.84): Ssh2Transport/TRCOMMON.C:1113: Sending packet with type 2 to connection
debug(24-MAY-2023 12:20:30.85): Ssh2Transport/TRCOMMON.C:1113: Sending packet with type 1 to connection
debug(24-MAY-2023 12:20:30.85): Ssh2Common/SSHCOMMON.C:180: DISCONNECT received: Algorithm negotiation failed.
debug(24-MAY-2023 12:20:30.85): SshReadLine/SSHREADLINE.C:3728: Uninitializing ReadLine...
warning: Authentication failed.
debug(24-MAY-2023 12:20:30.85): Ssh2/SSH2.C:327: locally_generated = TRUE
Disconnected; key exchange or algorithm negotiation failed (Algorithm negotiation failed.).


ssh username at hostname  -v

what are the correct format for options in OpenVMS for the image tcpip$ssh_ssh-keygen2.exe??

the equivalent of unix command:
ssh -o "KexAlgorithms diffie-hellman-group1-sha1" -o "HostKeyAlgorithms ssh-dss" -o "Ciphers aes256-cbc" -i chaveprivada username at hostname

also tried to change in the unix server to change sshd_config and added:
ciphers aes128-ctr,aes192-ctr,aes256-ctr,chacha20-poly1305 at openssh.com,aes256-cbc
KexAlgorithms curve25519-sha256 at libssh.org,diffie-hellman-group-exchange-sha256,diffie-hellman-group14-sha1,diffie-hellman-group1-sha1
macs hmac-sha2-256,hmac-sha2-512,hmac-sha1-96,hmac-sha1

as well hostkeyalgorithms ssh-dss

but still fails with the error:
All versions of OpenSSH handle kex guesses incorrectly
Couldn't agree on kex or hostkey alg. (chosen_kex = NULL, chosen_host
_key = ssh-rsa

here its confusing for me since if its been added "KexAlgorithms diffie-hellman-group1-sha1" in sshd_config of the unix system so OpenVMS should have stoped complaining about the KexAlgorithm...  

this attemp of changing sshd_config isn't a good option for security reasons but was to test if at least would fix in short term solution...

Thanks