Algorithm negotiation fail SSH in Jenkins

Question

I\'m trying to ssh from Jenkins to a local server but the following error is thrown:

[SSH] Exception:Algorithm negotiation fail
    com.jcraft.jsch.JSchExcep         


        

Answer 1

As outlined here: http://sourceforge.net/p/jsch/mailman/message/32975616/, in JSch 0.1.51 diffie-hellman-group-exchange-sha256 is implemented, but not enabled. You can enable it using the setConfig function like so:

JSch jsch = new JSch();

java.util.Properties configuration = new java.util.Properties();
configuration.put("kex", "diffie-hellman-group1-sha1,diffie-hellman-group14-sha1,diffie-hellman-group-exchange-sha1,diffie-hellman-group-exchange-sha256");
configuration.put("StrictHostKeyChecking", "no");

Session session = jsch.getSession("username", "hostname", 22);
session.setPassword("password");
session.setConfig(configuration);
session.connect();