IllegalStateException：无法协商服务器主机密钥算法的密钥交换

Question

java.lang.IllegalStateException: Unable to negotiate key exchange for server host key algorithms 
(client: ecdsa-sha2-nistp256,ecdsa-sha2-nistp384,ecdsa-sha2-nistp521,ssh-ed25519,ssh-rsa,ssh-dss / 
server: rsa-sha2-512,rsa-sha2-256)

引发错误的代码：

import org.apache.sshd.client.SshClient;
import org.apache.sshd.client.session.ClientSession;
import java.io.IOException;

public class Main{
    public static void main(String[] args) {
        SshClient client = SshClient.setUpDefaultClient();
        client.start();
        try {
                ClientSession session = client.connect("root", "172.17.0.2", 830).verify(10000).getSession();
                session.addPasswordIdentity("root");
                session.auth().verify(9999);
                // error 'Unable to negotiate key exchange for server host key algorithms' is thrown
        }
        catch (IOException e){
           e.printStackTrace();
        }
    }
}

Answer 1

我也没有解决我自己的问题，但我和你在同一个区域。但对我来说，查看SSHD日志，我想我看到客户机提供rsa_sha2_512，而（一个）服务器拒绝该请求并放弃连接请求。

这里有一个Scala小片段，对我来说没有任何改变。我认为这是你得到的，如果你不设置；（我找到的）每个默认工厂。

import org.apache.sshd.common.kex.{BuiltinDHFactories, KeyExchangeFactory}
 val kexList: util.List[KeyExchangeFactory] = {
        val kex = List(
          BuiltinDHFactories.dhg1,
          BuiltinDHFactories.dhg14,
          BuiltinDHFactories.dhgex,
          BuiltinDHFactories.dhg14_256,
          BuiltinDHFactories.dhg15_512,
          BuiltinDHFactories.dhg16_512,
          BuiltinDHFactories.dhg17_512,
          BuiltinDHFactories.dhg18_512,
          BuiltinDHFactories.dhgex256,
          BuiltinDHFactories.ecdhp256,
          BuiltinDHFactories.ecdhp384,
          BuiltinDHFactories.ecdhp521)
        val dh2kex = kex.map(k => ClientBuilder.DH2KEX(k))
        dh2kex.asJava
      }
      session.setKeyExchangeFactories(kexList)

或者在Java中是这样的：

    List<KeyExchangeFactory> kexList = 
BuiltinDHFactories.VALUES.stream().map(ClientBuilder.DH2KEX).collect(Collectors.toList());