SFTP Key Exchange Algorithms

Help & Support
1

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!

2

Currently supported algorithms are:

KEX: diffie-hellman-group-exchange-sha256, diffie-hellman-group-exchange-sha1, diffie-hellman-group14-sha1, diffie-hellman-group1-sha1, rsa2048-sha256, rsa1024-sha1

Cipher: Blowfish-256 SDCTR, Blowfish-128 CBC, single-DES CBC, triple-DES SDCTR, triple-DES SDCTR, triple-DES CBC, AES-256 SDCTR, AES-256 CBC, AES-192 SDCTR, AES-192 CBC, AES-128 SDCTR, AES-128 CBC, Arcfour-256, Arcfour-128

MAC: HMAC-SHA-256, HMAC-SHA1, HMAC-SHA1-96, HMAC-MD5

3

Thank you for the quick reply!