Error connecting to an SFTP server

[Consultor2024]

Hi team

I am testing a connection to an sftp server, but the test sends the following error:

com.jcraft.jsch.JSchAlgoNegoFailException: Algorithm negotiation fail: algorithmName="server_host_key" jschProposal="rsa-sha2-512,rsa-sha2-256,ecdsa-sha2-nistp256,ecdsa-sha2-nistp384,ecdsa-sha2-nistp521" serverProposal="ssh-rsa"

Do you have some information about this issue?

Thanks in advance for your support.

[April_Miao]

Seems you are using CI-PI, not CI-DS. Try with PI KBA 3348199 - SFTP Adapter: How to Configure Support for Deprecated Algorithms https://me.sap.com/notes/3348199

[April_Miao]

Another one from CI-PI KBA 3359283 - Error "com.jcraft.jsch.JSchAlgoNegoFailException: Algorithm negotiation fail" occurs after JSch library upgrade in July 2023 https://me.sap.com/notes/3359283

[djuggins43]

This error means your client and server cannot agree on an algorithm. The server only supports "ssh-rsa" and that is not supported in your client. Compare serverProposal against jschProposal lists, there's no match between them.

Most likely you are working with an old SFTP server using deprecated ciphers (i.e. not regarded as secure). If you check Enable support for Deprecated Algorithms.. it will probably work albeit with the security exposure.