Could not negotiate key exchange algorithm (wodSFTP / wodSFTP.NET / wodSFTPdll)

by movehoon19, Wednesday, December 11, 2024, 01:40 (20 days ago)

Hello.

The company is currently sending and receiving SFTP servers using "WeOnlyDo 3.6.1.160".
I recently purchased a company server and started using Red Hat Enterprise Linux 9, but I am inquiring about an error message between connections.

err: Could not negotiate key exchange algorithm.

The program did not set up algorithms separately, and it is in a default state.
The following information is registered on the server side.
Even if all the information is included, it continues to fail.

[admin@K-Sftp-14 ~]$ ssh -Q kex
diffie-hellman-group1-sha1
diffie-hellman-group14-sha1
diffie-hellman-group14-sha256
diffie-hellman-group16-sha512
diffie-hellman-group18-sha512
diffie-hellman-group-exchange-sha1
diffie-hellman-group-exchange-sha256
ecdh-sha2-nistp256
ecdh-sha2-nistp384
ecdh-sha2-nistp521
curve25519-sha256
curve25519-sha256@libssh.org
sntrup761x25519-sha512@openssh.com

[admin@K-Sftp-14 ~]$ ssh -Q cipher
3des-cbc
aes128-cbc
aes192-cbc
aes256-cbc
aes128-ctr
aes192-ctr
aes256-ctr
aes128-gcm@openssh.com
aes256-gcm@openssh.com
chacha20-poly1305@openssh.com

[admin@K-Sftp-14 ~]$ ssh -Q mac
hmac-sha1
hmac-sha1-96
hmac-sha2-256
hmac-sha2-512
hmac-md5
hmac-md5-96
umac-64@openssh.com
umac-128@openssh.com
hmac-sha1-etm@openssh.com
hmac-sha1-96-etm@openssh.com
hmac-sha2-256-etm@openssh.com
hmac-sha2-512-etm@openssh.com
hmac-md5-etm@openssh.com
hmac-md5-96-etm@openssh.com
umac-64-etm@openssh.com
umac-128-etm@openssh.com

I changed the RHEL 9 encryption policy from DEFAULT to LEGACY, and the transmission was possible. The algorithm I used was diffie-hellman-group-exchange-sha256 which I checked through the Log.
However, changing the encryption policy is impossible due to a security risk.

Do I need to upgrade W.o.d?

Please help me.

Thank you.