basic level, ssh task, Error occurred while running Task, ClassCastException, Bamboo Data Center 8.2
Asked by Apostal Fales:

![ssh_scr.jpeg](https://community.atlassian.com/t5/image/serverpage/image-id/316226iC992FEC38540548B/image-size/large?v=v2&px=999 "ssh_scr.jpeg")

++***I am noob, Ask for more information please if it is needed. I try to creat** **e basic ssh task get***++   
Error occurred while running Task '(2)' of type com.atlassian.bamboo.plugins.bamboo-scp-plugin:sshtask.  
java.lang.ClassCastException: class net.i2p.crypto.eddsa.EdDSAPublicKey cannot be cast to class net.i2p.crypto.eddsa.EdDSAPublicKey (net.i2p.crypto.eddsa.EdDSAPublicKey is in unnamed module of loader com.atlassian.bamboo.agent.bootstrap.classloading.ConditionallyDelegatingUrlClassLoader @565ff265; net.i2p.crypto.eddsa.EdDSAPublicKey is in unnamed module of loader org.apache.felix.framework.BundleWiringImpl$BundleClassLoader @56b5f44b) at net.schmizz.sshj.common.KeyType$6.writePubKeyContentsIntoBuffer(KeyType.java:202) at net.schmizz.sshj.common.KeyType.putPubKeyIntoBuffer(KeyType.java:388) at net.schmizz.sshj.common.Buffer.putPublicKey(Buffer.java:499) at net.schmizz.sshj.userauth.method.KeyedAuthMethod.putPubKey(KeyedAuthMethod.java:55) at net.schmizz.sshj.userauth.method.AuthPublickey.buildReq(AuthPublickey.java:62) at net.schmizz.sshj.userauth.method.AuthPublickey.buildReq(AuthPublickey.java:81) at net.schmizz.sshj.userauth.method.AbstractAuthMethod.request(AbstractAuthMethod.java:68) at net.schmizz.sshj.userauth.UserAuthImpl.authenticate(UserAuthImpl.java:73) at net.schmizz.sshj.SSHClient.auth(SSHClient.java:221) at net.schmizz.sshj.SSHClient.authPublickey(SSHClient.java:342) at com.atlassian.bamboo.plugins.scp.SshTask.execute(SshTask.java:114) at com.atlassian.bamboo.task.TaskExecutorImpl.lambda$executeTasks$3(TaskExecutorImpl.java:323) at com.atlassian.bamboo.task.TaskExecutorImpl.executeTaskWithPrePostActions(TaskExecutorImpl.java:258) at com.atlassian.bamboo.task.TaskExecutorImpl.executeTasks(TaskExecutorImpl.java:323) at com.atlassian.bamboo.task.TaskExecutorImpl.execute(TaskExecutorImpl.java:118) at com.atlassian.bamboo.build.pipeline.tasks.ExecuteBuildTask.call(ExecuteBuildTask.java:73) at com.atlassian.bamboo.v2.build.agent.DefaultBuildAgent.executeBuildPhase(DefaultBuildAgent.java:205) at com.atlassian.bamboo.v2.build.agent.DefaultBuildAgent.build(DefaultBuildAgent.java:177) at com.atlassian.bamboo.v2.build.agent.BuildAgentControllerImpl.lambda$waitAndPerformBuild$0(BuildAgentControllerImpl.java:169) at com.atlassian.bamboo.variable.CustomVariableContextImpl.withVariableSubstitutor(CustomVariableContextImpl.java:118) at com.atlassian.bamboo.v2.build.agent.BuildAgentControllerImpl.waitAndPerformBuild(BuildAgentControllerImpl.java:162) at com.atlassian.bamboo.v2.build.agent.DefaultBuildAgent.lambda$start$0(DefaultBuildAgent.java:122) at com.atlassian.bamboo.utils.BambooRunnables$1.run(BambooRunnables.java:48) at com.atlassian.bamboo.security.ImpersonationHelper.runWith(ImpersonationHelper.java:26) at com.atlassian.bamboo.security.ImpersonationHelper.runWithSystemAuthority(ImpersonationHelper.java:17) at com.atlassian.bamboo.security.ImpersonationHelper$1.run(ImpersonationHelper.java:41) at java.base/java.lang.Thread.run(Thread.java:829)


Answers:
author: Jyothi Charupalli
body: Hi [@Apostal Fales](/t5/user/viewprofilepage/user-id/5468191) ,

Welcome to Atlassian Community!

May I know which type of SSH key (RSA, Ed25519, etc.) you used for SSH key generation to connect to the SSH server?

I think you stumbled on this Bamboo Bug [BAM-21903: SSH or SCP tasks will fail if the SSH private key is of type ed25519](https://jira.atlassian.com/browse/BAM-21903) which was raised for Bamboo version \<= 8.2.4. Please refer to the BUG report for more details.

This was fixed in Bamboo versions 9.1.0, 8.2.7, and 9.0.2

Can you please confirm your Bamboo version to confirm if you are affected by this Bug? If you are using the affected Bamboo version, you can either upgrade your Bamboo version to one of the fixed versions or use any of the workarounds mentioned in the BUG report.

Best Regards,

Jyothi  
**\*please don't forget to Accept the answer if your query was answered\*\***

comments: author: Apostal Fales
body: You absolutly correct thank you so much. My version was 8.2.6, and ssh-keys [ed25519](https://jira.atlassian.com/browse/BAM-21903). You didn't just solve a problem; you illuminated a path for me. In the labyrinth of code, you were my guiding star. Best wishes)


Tags: data-center

ssh-task