java - JSch 连接问题：JSchException：算法协商失败 - 即使安装了 JCE

Question

我正在尝试使用 JSch 连接到服务器，但它会出现连接问题。我可以使用 PuTTY 连接到服务器，但不能使用 Java 代码。

我正在使用 jdk1.8.0_171

这是代码片段

session = jsch.getSession(username, server, SSH_PORT);
session.setPassword(password);
session.setConfig("StrictHostKeyChecking", "no");
session.setTimeout(timeout);
session.connect(timeout);

我收到以下异常：

com.jcraft.jsch.JSchException: Algorithm negotiation fail
at com.jcraft.jsch.Session.receive_kexinit(Session.java:590)
at com.jcraft.jsch.Session.connect(Session.java:320)

以下是 JSch 日志：

INFO: Connecting to <servername> port 22
INFO: Connection established
INFO: Remote version string: SSH-2.0-OpenSSH_8.0
INFO: Local version string: SSH-2.0-JSCH-0.1.54
INFO: CheckCiphers: aes256-ctr,aes192-ctr,aes128-ctr,aes256-cbc,aes192-cbc,aes128-cbc,3des-ctr,arcfour,arcfour128,arcfour256
INFO: CheckKexes: diffie-hellman-group14-sha1,ecdh-sha2-nistp256,ecdh-sha2-nistp384,ecdh-sha2-nistp521
INFO: CheckSignatures: ecdsa-sha2-nistp256,ecdsa-sha2-nistp384,ecdsa-sha2-nistp521
INFO: SSH_MSG_KEXINIT sent
INFO: SSH_MSG_KEXINIT received
INFO: kex: server: [e-mail],diffie-hellman-group18-sha512,diffie-hellman-group14-sha256,diffie-hellman-group16-sha512
INFO: kex: server: rsa-sha2-512,rsa-sha2-256,ssh-rsa
INFO: kex: server: [e-mail],[e-mail],[e-mail],aes256-ctr,aes192-ctr,aes128-ctr
INFO: kex: server: [e-mail],[e-mail],[e-mail],aes256-ctr,aes192-ctr,aes128-ctr
INFO: kex: server: [e-mail],[e-mail],hmac-sha2-512,hmac-sha2-256,[e-mail],hmac-sha1,[e-mail],[e-mail],[e-mail],[e-mail]
INFO: kex: server: [e-mail],[e-mail],hmac-sha2-512,hmac-sha2-256,[e-mail],hmac-sha1,[e-mail],[e-mail],[e-mail],[e-mail]
INFO: kex: server: none,[e-mail]
INFO: kex: server: none,[e-mail]
INFO: kex: server: 
INFO: kex: server: 
INFO: kex: client: ecdh-sha2-nistp256,ecdh-sha2-nistp384,ecdh-sha2-nistp521,diffie-hellman-group14-sha1,diffie-hellman-group-exchange-sha256,diffie-hellman-group-exchange-sha1,diffie-hellman-group1-sha1
INFO: kex: client: ssh-rsa,ssh-dss,ecdsa-sha2-nistp256,ecdsa-sha2-nistp384,ecdsa-sha2-nistp521
INFO: kex: client: aes128-ctr,aes128-cbc,3des-ctr,3des-cbc,blowfish-cbc,aes192-ctr,aes192-cbc,aes256-ctr,aes256-cbc
INFO: kex: client: aes128-ctr,aes128-cbc,3des-ctr,3des-cbc,blowfish-cbc,aes192-ctr,aes192-cbc,aes256-ctr,aes256-cbc
INFO: kex: client: hmac-md5,hmac-sha1,hmac-sha2-256,hmac-sha1-96,hmac-md5-96
INFO: kex: client: hmac-md5,hmac-sha1,hmac-sha2-256,hmac-sha1-96,hmac-md5-96
INFO: kex: client: none
INFO: kex: client: none
INFO: kex: client: 
INFO: kex: client: 
INFO: Disconnecting from <servername> port 22
com.jcraft.jsch.JSchException: Algorithm negotiation fail

这是pom文件：

<dependency>
    <groupId>com.jcraft</groupId>
    <artifactId>jsch</artifactId>
    <version>0.1.54</version>
</dependency>

我也尝试使用 JSch 0.1.55，仍然是同样的问题。

我检查了JSchException: Algorithm协商失败。但正如您在日志中看到的，所有密码都可用。

最好不要在服务器端进行任何更改。

我该如何解决这个问题？谢谢您的帮助。

标签： javasessionsshconnectionjsch

Answer 1

对于那些面临此问题的人，请将您的 pom 从以下位置更改：

<!-- https://mvnrepository.com/artifact/com.jcraft/jsch -->
<dependency>
    <groupId>com.jcraft</groupId>
    <artifactId>jsch</artifactId>
    <version>0.1.54</version>
</dependency>

至：

<!-- https://mvnrepository.com/artifact/com.github.mwiede/jsch -->
<dependency>
    <groupId>com.github.mwiede</groupId>
    <artifactId>jsch</artifactId>
    <version>0.1.72</version>
</dependency>

这是存储库：https ://github.com/mwiede/jsch