Knowledge BaseTroubleshootingExternal service port connections are unstable after an EIP is attached to a VM instance

External service port connections are unstable after an EIP is attached to a VM instance

TroubleshootingZCF · CloudVersions3.x-5.5.30Article IDKB-100256Updated2026-08-19

Issue/Introduction

This article describes how to troubleshoot unstable external service port connections after an EIP is attached to a VM instance. 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

Symptoms

After an EIP is attached to a VM instance, connections to external service ports are unstable and frequently fail.

Possible causes

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External service port connections are unstable after an EIP is attached to a VM instance | KB-100256 | ZStack Resource Center