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That cipher is not supported by the library, I to have ran in to issues do to it :(

Sent from my iPhone

On Aug 27, 2018, at 7:17 AM, AtosNicoS [email protected] wrote:

Hi, I am using 2016.1.0 and I am trying to connect to a TeltonikaRUT955 Modem via SSH. I just updated the firmware to a newer version which has "Improved SSH security" in its changelog. I can no longer login via SSH.NET, only via Putty.

It seems that SSH.NET does not support newer cipher algorithms. Do you know more about this?
Putty logs the following:

2018-08-27 12:59:28 We claim version: SSH-2.0-PuTTY_Release_0.70
[...]
2018-08-27 12:59:28 Doing ECDH key exchange with curve Curve25519 and hash SHA-256
[...]
2018-08-27 12:59:30 Initialised AES-256 SDCTR client->server encryption
2018-08-27 12:59:30 Initialised HMAC-SHA-256 client->server MAC algorithm
2018-08-27 12:59:30 Initialised AES-256 SDCTR server->client encryption
2018-08-27 12:59:30 Initialised HMAC-SHA-256 server->client MAC algorithm
[...]
Downgrading the firmware is not an option in case of the SSH and overall system security.

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Originally posted by @darkoperator in sshnet/SSH.NET#461 (comment)