Error: The client and the server have no common algorithms

Hello,

I have this version:
Rebex.Net.Sftp = v4.0.30319

And recently our partner is upgrading their SSH host keys from
1028bits to 2048bits.

Additionally they are only going to accept three ciphers:

1. aes256-ctr
2. aes192-ctr
3. aes128-ctr

and three MAC:

1. hmac-sha256
2. hmac-sha2-256
3. hmac-sha2-512

So without making any code changes I tried to connect to their UAT server to start testing and I get this error...the error in the subject line.

I have no idea what the ciphers nor MAC mean, but I read other post to see if I could figure it out.

Here's what I found:

1. I cannot log because I do not have RebEx.Common.dll anywhere on my system.
2. I cannot change any settings because Settings is not a class in SFTP in my version.
3. If I change the hostname back to production (because they have not roll in this change yet) I can connect (sftp.connect(hostname)) just fine.

So, I need helps please.

Thanks,
Ray