使用 JSch 打開 SSH 通道時出現“會話已關閉”錯誤

Question

我用 JSch 制作了一個 SSH 客戶端。 客戶端與我的 Apache Mina SSH 服務器正常工作。 但是當我用真實的設備測試它時，它失敗了。

這是客戶端的代碼：

public boolean openConnection() throws ItsSshException {

   boolean connectSuccess = false;
   Properties config = new Properties();
   config.put("StrictHostKeyChecking", "no");
   jschSSH.setConfig(config);
    try {
     sshSession = jschSSH.getSession(username, hostname, port);
     sshSession.setPassword(password);
     sshSession.connect(connectionTimeout);
     LOGGER.info("Connection timeout : " + connectionTimeout);
     Thread.sleep(1000);
     sshHChannel = sshSession.openChannel("shell");
     sshHChannel.connect();
     in = sshHChannel.getInputStream();
     out = new PrintStream(sshHChannel.getOutputStream());
     clearInitialSocketState();
     connectSuccess = true;
   } catch (Exception e) {
     LOGGER.error("Error during connecting to host: " + hostname +
                  ", port: " + port + "!", e);
     throw new ItsSshException("Error during connecting to host: " + e.getMessage());
   }
   LOGGER.info("connectSuccess : " + connectSuccess);
   return connectSuccess;
}

此時代碼失敗：

sshHChannel = sshSession.openChannel("shell");

連接主機時出錯：127.0.0.1，端口：22！
com.jcraft.jsch.JSchException：會話已關閉
在 com.jcraft.jsch.Session.openChannel(Session.java:861)

我的問題是如何解決這個問題，什么可以讓它發生？

這是 JSch 日志：

INFO: Connecting to 127.0.0.1 port 22 
INFO: Connection established 
INFO: Remote version string: SSH-2.0-Mocana SSH
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: aes256-ctr is not available.
INFO: aes192-ctr is not available.
INFO: aes256-cbc is not available.
INFO: aes192-cbc is not available.
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: diffie-hellman-group14-sha1,diffie-hellman-group1-sha1
INFO: kex: server: ssh-dss,ssh-rsa
INFO: kex: server: aes256-cbc,rijndael256-cbc,aes192-cbc,rijndael192-cbc,aes128-cbc,rijndael128-cbc,3des-cbc,arcfour
INFO: kex: server: aes256-cbc,rijndael256-cbc,aes192-cbc,rijndael192-cbc,aes128-cbc,rijndael128-cbc,3des-cbc,arcfour
INFO: kex: server: hmac-sha1,hmac-sha1-96,hmac-md5,hmac-md5-96
INFO: kex: server: hmac-sha1,hmac-sha1-96,hmac-md5,hmac-md5-96
INFO: kex: server: none
INFO: kex: server: none
INFO: kex: server: 
INFO: kex: server: 
INFO: kex: client: 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
INFO: kex: client: aes128-ctr,aes128-cbc,3des-ctr,3des-cbc,blowfish-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: kex: server->client aes128-cbc hmac-md5 none
INFO: kex: client->server aes128-cbc hmac-md5 none
INFO: SSH_MSG_KEXDH_INIT sent
INFO: expecting SSH_MSG_KEXDH_REPLY
INFO: ssh_rsa_verify: signature true
WARN: Permanently added '127.0.0.1' (RSA) to the list of known hosts.
INFO: SSH_MSG_NEWKEYS sent
INFO: SSH_MSG_NEWKEYS received
INFO: SSH_MSG_SERVICE_REQUEST sent
INFO: SSH_MSG_SERVICE_ACCEPT received
INFO: Authentications that can continue: publickey,keyboard-interactive,password
INFO: Next authentication method: publickey
INFO: Authentications that can continue: keyboard-interactive,password
INFO: Next authentication method: keyboard-interactive
INFO: Authentications that can continue: password
INFO: Next authentication method: password
INFO: Authentication succeeded (password).
INFO: Caught an exception, leaving main loop due to End of IO Stream Read
INFO: Disconnecting from 127.0.0.1 port 22

Answer 1

刪除這個：

Thread.sleep(1000);

服務器可能在等待來自客戶端 (JSch) 的請求時超時並中止連接。

Answer 2

嘗試使用：

Properties config = new Properties();
config.put("StrictHostKeyChecking", "no");
config.put("PreferredAuthentications", "password");
jschSSH.setConfig(config);

並且還設置

sshSession.connect(connectionTimeout) to 5000 or more.

也正如馬丁所說

remove Thread.sleep(1000);

Answer 3

由於不同的原因，我得到了這個確切的錯誤。

基本上我沒有正確斷開連接並且打開了太多會話。

因此，當我嘗試連接時，它給了我你得到的確切堆棧跟蹤。

只需終止所有連接（pkill）並正確斷開連接即可解決我的問題。