New-SSHSession not working against certain ciphers

Hi,

I’ve inherited and environment of ESXi hosts where thy are running a special list of ciphers in sshd_config of each ESXi host. The list is below

KexAlgorithms ecdh-sha2-nistp256,ecdh-sha2-nistp384,ecdh-sha2-nistp521,diffie-hellman-group-exchange-sha256,diffie-hellman-group16-sha512,diffie-hellman-group18-sha512,diffie-hellman-group14-sha256

HostKeyAlgorithms ecdsa-sha2-nistp256,ecdsa-sha2-nistp384,ecdsa-sha2-nistp521,rsa-sha2-256,rsa-sha2-512

I cannot establish SSH connection using new-sshsession from posh-ssh 2.3.0, PS 5.1 and Windows 2019 server. As soon as I comment out these lines I am able to connect. Is there anything that can be done for POSH-SSH to support the algo’s above?

Thanks, ionut

[darkoperator]

Yes

Sent from my iPhone

On Sep 4, 2021, at 3:44 PM, Peter Bosgraaf @.***> wrote:

Hi,

Not trying to hijack the thread, but I’m facing the same issue and just wanted to check upon this issue. Since posh-ssh 3.0 is out already, did the new ssh.net lib with the new cyphers got included in the final release? In other words, do you feel it should work now?

My esx host supports:

KexAlgorithms ecdh-sha2-nistp256 ecdh-sha2-nistp384 ecdh-sha2-nistp521 diffie-hellman-group-exchange-sha256 diffie-hellman-group16-sha512 diffie-hellman-group18-sha512 diffie-hellman-group14-sha256

Ciphers @.*** @.*** aes256-ctr aes192-ctr aes128-ctr

MACs hmac-sha2-256 hmac-sha2-512

Most of these cyphers are listed on ssh.net as supported: https://github.com/sshnet/SSH.NET

Thanks!

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[mikemayops]

@darkoperator Oh I see. I’ll have to reach out to the vendor then since its cloud hosed. Thanks!