---
title: "Security Monitoring troubleshooting"
slug: "securitymonitoring-troubleshoot"
updated: 2026-09-17T09:05:15Z
published: 2026-09-17T09:19:55Z
canonical: "guide.ncloud-docs.com/securitymonitoring-troubleshoot"
stale: true
---

> ## Documentation Index
> Fetch the complete documentation index at: https://guide.ncloud-docs.com/llms.txt
> Use this file to discover all available pages before exploring further.

# Security Monitoring troubleshooting

Available in Classic and VPC

This page lists problems you might run into when using Security Monitoring. Click on the error to see more details.

## Troubleshooting common issues

The following are examples of common errors you might encounter:

[Unable to add monitoring targets](/docs/en/securitymonitoring-troubleshoot-common#%EA%B4%80%EC%A0%9C%EB%8C%80%EC%83%81%EC%B6%94%EA%B0%80%EB%B6%88%EA%B0%80) Unable to add monitoring targets to IDS.

[Log viewing menu missing](/docs/en/securitymonitoring-troubleshoot-common#%EB%A1%9C%EA%B7%B8%EC%A1%B0%ED%9A%8C%EB%A9%94%EB%89%B4%EC%97%86%EC%9D%8C) There is no menu available to view logs.

["Invalid domain" error message](/docs/en/securitymonitoring-troubleshoot-common#%EC%9C%A0%ED%9A%A8%ED%95%98%EC%A7%80%EC%95%8A%EC%9D%80%EB%8F%84%EB%A9%94%EC%9D%B8%EC%9E%85%EB%8B%88%EB%8B%A4%EC%98%A4%EB%A5%98%EB%A9%94%EC%8B%9C%EC%A7%80) When registering a CNAME, "Invalid domain" error message appears.

[SSH connection timeout](/docs/en/securitymonitoring-troubleshoot-common#ssh%EC%A0%91%EC%86%8D%EC%8B%9C%ED%83%80%EC%9E%84%EC%95%84%EC%9B%83%EB%B0%9C%EC%83%9D) A timeout occurs during SSH connection attempts.

[502 bad gateway](/docs/en/securitymonitoring-troubleshoot-common#502badgateway) After applying for WAF and setting up the ACL's inbound/outbound via the provided VIP, a 502 error occurs. The 502 bad gateway error occurs.

## Agent issues

The following are examples of common errors related to Agent you might encounter:

[Agent status issue](/docs/en/securitymonitoring-troubleshoot-agent#Agent%EC%83%81%ED%83%9C%EB%AC%B8%EC%A0%9C) The agent is installed, but its status shows as off in NAVER Cloud Platform console.

[Agent execution error](/docs/en/securitymonitoring-troubleshoot-agent#Agent%EC%8B%A4%ED%96%89%EC%98%A4%EB%A5%98) The agent is not being executed.

## Learning resources

We offer various materials for you to explore. To learn more about Security Monitoring, check out these helpful links:

- FAQ: [frequently asked questions about Security Monitoring](https://www.ncloud.com/support/faq/prod?categoryCode2=SEC&categoryCode3=SV_0043&page=1)
- NAVER Cloud Platform blog: [analysis of security technology trends in 2024: building NCP security architecture](https://blog.naver.com/n_cloudplatform/223379603772?trackingCode=blog_bloghome_searchlist)
- 

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