After I upgraded from 2.414.3-lts-jdk11 to 2.440.1 and upgrade some plugins that sshCommand got exception.

I was using private key with the ed25519 type at first. I then tried changing the private key to the rsa type, and it worked!

I also try to create a new ed25519 key but still encount same problem.

Our code as follow:

def remote = [:]
remote.name = 'xxxx'
remote.host = 'xxxx'
remote.port = 22
remote.allowAnyHosts = true
steps.withCredentials([steps.sshPrivateKey(credentialsId: Const.KEY_NAME, keyFileVariable: 'identity', passphraseVariable: '', usernameVariable: 'userName')]) {
    remote.user = steps.userName
    remote.identityFile = steps.identity
    steps.sshCommand(command: "ls /root", remote: remote, failOnError: true)
} 

Traceback: 
[SEVERE] com.jcraft.jsch.JSchException: Auth fail for methods 'publickey,password'
com.jcraft.jsch.Session.connect(Session.java:521)
com.jcraft.jsch.Session.connect(Session.java:199)
com.jcraft.jsch.Session$connect$1.call(Unknown Source)
org.hidetake.groovy.ssh.connection.ConnectionManager.connectInternal(ConnectionManager.groovy:107)
java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
java.base/java.lang.reflect.Method.invoke(Method.java:566)
org.codehaus.groovy.reflection.CachedMethod.invoke(CachedMethod.java:98)
groovy.lang.MetaMethod.doMethodInvoke(MetaMethod.java:325)
org.codehaus.groovy.runtime.metaclass.ClosureMetaClass.invokeMethod(ClosureMetaClass.java:352)
groovy.lang.MetaClassImpl.invokeMethod(MetaClassImpl.java:1034)
org.codehaus.groovy.runtime.callsite.PogoMetaClassSite.callCurrent(PogoMetaClassSite.java:68)
org.codehaus.groovy.runtime.callsite.AbstractCallSite.callCurrent(AbstractCallSite.java:193)
org.hidetake.groovy.ssh.connection.ConnectionManager$_connectInternal_closure1.doCall(ConnectionManager.groovy:85)
org.hidetake.groovy.ssh.connection.ConnectionManager$_connectInternal_closure1.doCall(ConnectionManager.groovy)