手动ssh没问题，cachecloudssh报错

[macoli]

cachecloud上配置了ssh后，日志中报错，但是手动去ssh连接是正常的。
系统版本：CentOS Linux release 7.9.2009
java version "1.8.0_212"

2023-03-09 12:03:02.514 ERROR 10639 --- [h-pool-thread-1] com.sohu.cache.ssh.SSHTemplate : getConnection xx.xx.xx.xx:22 error message is There was a problem while connecting to xx.xx.xx.xx:22

java.io.IOException: There was a problem while connecting to xx.xx.xx.xx:22
at ch.ethz.ssh2.Connection.connect(Connection.java:699)
at com.sohu.cache.ssh.SSHTemplate$1.execute(SSHTemplate.java:102)
at com.sohu.cache.util.IdempotentConfirmer.run(IdempotentConfirmer.java:27)
at com.sohu.cache.ssh.SSHTemplate.getConnection(SSHTemplate.java:122)
at com.sohu.cache.ssh.SSHTemplate.execute(SSHTemplate.java:50)
at com.sohu.cache.ssh.SSHUtil.getMachineInfo(SSHUtil.java:73)
at com.sohu.cache.machine.impl.MachineCenterImpl.collectMachineInfo(MachineCenterImpl.java:144)
at com.sohu.cache.machine.impl.MachineCenterImpl$1.execute(MachineCenterImpl.java:118)
at com.sohu.cache.machine.impl.MachineCenterImpl$1.execute(MachineCenterImpl.java:115)
at com.sohu.cache.async.KeyCallable.call(KeyCallable.java:22)
at java.util.concurrent.FutureTask.run(FutureTask.java:266)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
at java.lang.Thread.run(Thread.java:748)
Caused by: java.io.IOException: Key exchange was not finished, connection is closed.
at ch.ethz.ssh2.transport.KexManager.getOrWaitForConnectionInfo(KexManager.java:91)
at ch.ethz.ssh2.transport.TransportManager.getConnectionInfo(TransportManager.java:229)
at ch.ethz.ssh2.Connection.connect(Connection.java:655)
... 13 common frames omitted
Caused by: java.io.IOException: Cannot negotiate, proposals do not match.
at ch.ethz.ssh2.transport.KexManager.handleMessage(KexManager.java:412)
at ch.ethz.ssh2.transport.TransportManager.receiveLoop(TransportManager.java:753)
at ch.ethz.ssh2.transport.TransportManager$1.run(TransportManager.java:468)
... 1 common frames omitted

[githubname1024]

请问ssh要连接的机器的系统也是CentOS Linux release 7.9.2009吗？

[macoli]

是的，被ssh的机器提示如下：
sshd[32664]: Unable to negotiate with xx.xx.xx.xx port 15639: no matching key exchange method found. Their offer: diffie-hellman-group-exchange-sha1,diffie-hellman-group14-sha1,diffie-hellman-group1-sha1 [preauth]

看记录应该是不支持ssh协议，当前系统只支持
kexalgorithms curve25519-sha256,[email protected],ecdh-sha2-nistp256,ecdh-sha2-nistp384,ecdh-sha2-nistp521,diffie-hellman-group-exchange-sha256

[githubname1024]

可以按照网上解决方式，修改一下KexAlgorithms。

[macoli]

当前已通过修改KexAlgorithms解决了，不过cachecloud能否支持更多的ssh协议呢

[githubname1024]

我们后边会评估考虑。另外，也欢迎提交pull request。

[PaimonAllen]

Hi, here is the same problem in Ubuntu 20.04.
Caused by: java.io.IOException: Key exchange was not finished, connection is closed.
at ch.ethz.ssh2.transport.KexManager.getOrWaitForConnectionInfo(KexManager.java:91)
at ch.ethz.ssh2.transport.TransportManager.getConnectionInfo(TransportManager.java:229)
at ch.ethz.ssh2.Connection.connect(Connection.java:655)
... 14 common frames omitted
Caused by: java.io.IOException: Cannot negotiate, proposals do not match.
at ch.ethz.ssh2.transport.KexManager.handleMessage(KexManager.java:412)
at ch.ethz.ssh2.transport.TransportManager.receiveLoop(TransportManager.java:753)
at ch.ethz.ssh2.transport.TransportManager$1.run(TransportManager.java:468)
... 1 common frames omitted

and log in Ubuntu 20.04 /var/log/auth.log
Unable to negotiate with ... port 63183: no matching key exchange method found. Their offer: diffie-hellman-group-exchange-sha1,diffie-hellman-group14-sha1,diffie-hellman-group1-sha1 [preauth]