I have two VMs (Ubuntu) configured on Oracle Virtual Box. I need to set up Jenkin controller (VM1) with Jenkin agent (VM2) to execute set of tasks. Connection is failing with the below exception. Request you to please suggest.
SSHLauncher{host=‘192.168.12.3’, port=22, credentialsId=‘jenkins-agent’, jvmOptions=‘’, javaPath=‘’, prefixStartSlaveCmd=‘’, suffixStartSlaveCmd=‘’, launchTimeoutSeconds=60, maxNumRetries=10, retryWaitTime=15, sshHostKeyVerificationStrategy=hudson.plugins.sshslaves.verifiers.NonVerifyingKeyVerificationStrategy, tcpNoDelay=true, trackCredentials=true}
[04/05/24 02:13:53] [SSH] Opening SSH connection to 192.168.12.3:22.
[04/05/24 02:13:53] [SSH] WARNING: SSH Host Keys are not being verified. Man-in-the-middle attacks may be possible against this connection.
ERROR: Server rejected the 1 private key(s) for root (credentialId:jenkins-agent/method:publickey)
ERROR: Failed to authenticate as root with credential=jenkins-agent
java.io.IOException: Publickey authentication failed.
at com.trilead.ssh2.auth.AuthenticationManager.authenticatePublicKey(AuthenticationManager.java:349)
at com.trilead.ssh2.Connection.authenticateWithPublicKey(Connection.java:472)
at com.cloudbees.jenkins.plugins.sshcredentials.impl.TrileadSSHPublicKeyAuthenticator.doAuthenticate(TrileadSSHPublicKeyAuthenticator.java:110)
at com.cloudbees.jenkins.plugins.sshcredentials.SSHAuthenticator.authenticate(SSHAuthenticator.java:431)
at com.cloudbees.jenkins.plugins.sshcredentials.SSHAuthenticator.authenticate(SSHAuthenticator.java:468)
at hudson.plugins.sshslaves.SSHLauncher.openConnection(SSHLauncher.java:882)
at hudson.plugins.sshslaves.SSHLauncher.lambda$launch$0(SSHLauncher.java:441)
at java.base/java.util.concurrent.FutureTask.run(FutureTask.java:264)
at java.base/java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1136)
at java.base/java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:635)
at java.base/java.lang.Thread.run(Thread.java:840)
Caused by: java.io.IOException: Could not generate signature
at com.trilead.ssh2.signature.KeyAlgorithm.generateSignature(KeyAlgorithm.java:43)
at com.trilead.ssh2.auth.AuthenticationManager.authenticatePublicKey(AuthenticationManager.java:316)
… 10 more
Caused by: java.security.SignatureException: Could not sign data
at java.base/sun.security.rsa.RSASignature.engineSign(RSASignature.java:197)
at java.base/java.security.Signature$Delegate.engineSign(Signature.java:1423)
at java.base/java.security.Signature.sign(Signature.java:712)
at com.trilead.ssh2.signature.KeyAlgorithm.generateSignature(KeyAlgorithm.java:41)
… 11 more
Caused by: javax.crypto.BadPaddingException: RSA private key operation failed
at java.base/sun.security.rsa.RSACore.crtCrypt(RSACore.java:209)
at java.base/sun.security.rsa.RSACore.rsa(RSACore.java:130)
at java.base/sun.security.rsa.RSASignature.engineSign(RSASignature.java:194)
… 14 more
[04/05/24 02:13:53] [SSH] Authentication failed.
Authentication failed.
[04/05/24 02:13:53] Launch failed - cleaning up connection
[04/05/24 02:13:53] [SSH] Connection closed.