I've hardened my SSH configuration to only support known good key exchange algorithms, ciphers and macs - however, apparently none of these stronger KEX settings are available in DOpus? What is the strongest KEX, Cipher and MAC supported/recommended by DOpus (version 12.14)?
I get the error below when I attempt to connect to a hardened ssh server:
Server version: SSH-2.0-OpenSSH_7.4
Using SSH protocol version 2
We claim version: SSH-2.0-PuTTY_Directory_Opus
Couldn't agree a key exchange algorithm (available: curve25519-sha256@libssh.org,diffie-hellman-group14-sha256,diffie-hellman-group16-sha512,diffie-hellman-group18-sha512)
SSH: Fatal: Couldn't agree a key exchange algorithm (available: curve25519-sha256@libssh.org,diffie-hellman-group14-sha256,diffie-hellman-group16-sha512,diffie-hellman-group18-sha512)
Connection closed
Thanks!