Aria Orchestrator "Run SSH command" workflow fails to connect to RHEL9 servers

Products

• VMware Aria Suite

Issue/Introduction

Symptoms:

• Run SSH command workflow fails to connect to RHEL9 servers.
• You see an error similar to:
  
  Unable to execute command: InternalError: Session.connect: java.io.IOException: End of IO Stream Read
  
  or
  
  Unable to execute command: InternalError: Session.connect: java.security.SignatureException: Signature length not correct: got 404 but was expecting 384

   

Environment

VMware Aria Automation Orchestrator 8.x

Cause

This issue is caused due to a change with default cryptographic policies in RHEL9.

Resolution

Workaround:

• Use the attached updated version of the SSH plugin to use Key Authentication
• To workaround this issue, update the cryptographic policy to SHA1 on the affected RHEL9 server. For more information, see Redhat documentation.
  
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Additional Information

Impact/Risks:

Enabling SHA-1 cryptographic policy weakens the security of the system.