Knowledge BaseTroubleshootingUnable to connect to a VM instance over SSH

Unable to connect to a VM instance over SSH

TroubleshootingZCF · CloudVersions3.x-5.5.30Article IDKB-100171Updated2026-08-19

Issue/Introduction

This article describes how to troubleshoot inability to connect to a VM instance over SSH. It applies to the initial diagnosis and resolution of similar issues in ZStack Cloud.

Environment

  • Product: ZCF
  • Component: Cloud
  • Version: 3.x-5.5.30

Resolution

Check network connectivity and ensure that the network and port can communicate normally, and then try the following methods:

  • If the Linux security policy marks the account as expired, sign-in fails. Run chage -l root

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Unable to connect to a VM instance over SSH | KB-100171 | ZStack Resource Center