SEO fix guide
Canonical Tag Targets a Broken URL
A canonical tag points to a URL that returns a 4xx or 5xx error. Search engines cannot follow this reference.
Issue ID: CRAWL-CANONICAL-4XX-001
Severity: major
Impact: High
Effort: S
Use this article when
- You need deeper remediation guidance than the issue card can show.
- You want CMS-specific steps before handing the fix to a developer.
- You want a repeatable re-check path after shipping the change.
What this issue is
A canonical tag points to a URL that returns a 4xx or 5xx error. Search engines cannot follow this reference.
Why it matters
A canonical tag points to a URL that returns a 4xx or 5xx error. Search engines cannot follow this reference. This affects how clearly search engines understand the page and how persuasive it looks in search results.
How we detect it
- FreeSiteAudit flags this issue when the rule for CRAWL-CANONICAL-4XX-001 fails and the page evidence points to Head metadata.
- You can usually confirm this by checking the page source or the relevant page settings inside your CMS.
Evidence examples
Check the affected page source, rendered output, or relevant CMS setting to confirm the missing or incorrect element.
How to fix it
- 1Fix the target URL so it returns a 200 OK
- 2Or update the canonical tag to a valid URL
How to re-check it
- Confirm the canonical URL returns HTTP 200
Related tools
This issue is best verified with the full FreeSiteAudit crawl rather than a single-point mini tool.