XML Sitemap Errors: Common Problems and How to Fix The

An XML sitemap helps search engines discover important pages on a website. When a sitemap contains errors, search engines may have difficulty finding the right URLs, processing updates, or understanding which pages should be crawled.

Common problems include URLs that return errors, redirected pages, incorrect canonical URLs, non-indexable pages, and outdated sitemap entries. These issues can make a sitemap less useful and may prevent important pages from being discovered as intended.

Finding and fixing XML sitemap errors helps keep sitemap data accurate, improves crawl efficiency, and makes it easier for search engines to discover the pages you want indexed.

What Is an XML Sitemap?

An XML sitemap is a file that lists URLs you want search engines to discover and potentially crawl. It provides information about a website's important pages in a structured format that search engines can process.

A sitemap commonly uses the following XML elements:

• <loc>: Specifies the URL of a page.
• <lastmod>: Indicates when the page was last modified, if the date is known and accurate.
• <changefreq>: Suggests how frequently a page may change. Google does not use this value for crawling.
• <priority>: Indicates the relative importance of a URL within the site. Google ignores this value.

A basic sitemap entry looks like this:

<?xml version="1.0" encoding="UTF-8"?>
<urlset xmlns="http://www.sitemaps.org/schemas/sitemap/0.9">
  <url>
    <loc>https://example.com/technical-seo/</loc>
    <lastmod>2026-09-20</lastmod>
  </url>
  <url>
    <loc>https://example.com/seo-audit/</loc>
    <lastmod>2026-09-22</lastmod>
  </url>
</urlset>

A sitemap does not guarantee that a page will be crawled or indexed. It helps search engines discover URLs, but indexing depends on other factors, including page accessibility, content quality, and indexing directives.

Why XML Sitemap Errors Matter

An inaccurate sitemap can waste crawl resources on URLs that are redirected, blocked, missing, or not intended for indexing. It can also make it harder for search engines to identify the pages you want them to discover.

For example, a sitemap may list 1,000 URLs, but 200 of those URLs might redirect, return a 404 error, or contain a noindex directive. The sitemap would then include many entries that do not represent the site's intended indexable pages.

The goal is not to submit as many URLs as possible. It is to maintain a sitemap that accurately reflects the important pages on your website.

Common XML Sitemap Errors and How to Fix Them

1. URLs Returning 404 Errors

A 404 error occurs when a requested page cannot be found. If a sitemap includes URLs that return 404 responses, search engines may repeatedly encounter pages that no longer exist.

This often happens after website redesigns, deleted pages, changes to URL structures, or content migrations.

How to find the issue

• Open your XML sitemap and review the listed URLs.
• Crawl the sitemap URLs using a website crawler.
• Check the HTTP status codes of the listed pages.
• Identify URLs returning 404 or other client errors.

How to fix it

1. Remove deleted URLs from the sitemap if the pages are permanently gone.
2. Restore the page if it was removed accidentally and is still needed.
3. Redirect an old URL to a relevant replacement page when an appropriate replacement exists.
4. Update internal links that point to deleted URLs.
5. Regenerate and resubmit the sitemap after making corrections.

Avoid redirecting every deleted URL to the homepage. Redirects should lead to relevant replacement content where possible.

2. URLs Returning 301 or 302 Redirects

A redirect sends visitors and crawlers from one URL to another. While redirects are a normal part of website maintenance, sitemap entries should generally point directly to the final destination URL.

For example, a sitemap might contain:

https://example.com/old-page/

That URL redirects to:

https://example.com/new-page/

The sitemap should normally list the destination URL rather than the redirecting URL.

How to find the issue

Check the HTTP status codes of URLs in your sitemap. Look for URLs returning 301 or 302 responses and record their final destinations.

How to fix it

• Replace redirecting URLs with their final destination URLs.
• Remove obsolete URLs that no longer have a relevant destination.
• Update internal links that still point to redirected URLs.
• Check for redirect chains and replace them with direct links where possible.

3. Non-Indexable URLs in the Sitemap

A sitemap should generally contain pages you want search engines to index. URLs with a noindex directive are not suitable sitemap entries because the directive explicitly tells search engines not to index those pages.

For example, a page may return a successful HTTP response but include this HTML tag:

<meta name="robots" content="noindex">

It may also contain an HTTP X-Robots-Tag: noindex response header.

How to find the issue

• Crawl your sitemap URLs and check their indexability.
• Review the robots meta tags on the listed pages.
• Check for X-Robots-Tag directives in response headers.
• Compare sitemap entries with the website's intended indexable pages.

How to fix it

1. Remove URLs from the sitemap if they are intentionally set to noindex.
2. If a page should be indexed, remove the unintended noindex directive.
3. Verify that the page is accessible to search engines.
4. Regenerate the sitemap and check the affected URLs again.

Do not remove a noindex directive simply to make a sitemap report pass. First confirm that the page is meant to appear in search results.

4. Blocked URLs in the Sitemap

A sitemap can contain URLs that are blocked by the website's robots.txt file. This creates a mismatch between the URLs submitted for discovery and the pages that crawlers are permitted to access.

For example, the following directive blocks crawling of the /private/ directory:

User-agent: *
Disallow: /private/

If the sitemap lists URLs within that directory, search engines may be unable to crawl those pages.

How to find the issue

• Review the website's robots.txt file.
• Compare its disallow rules against the URLs listed in the sitemap.
• Check crawler reports for URLs blocked by robots.txt.

How to fix it

• Remove URLs from the sitemap that are intentionally blocked and not meant for indexing.
• If important pages should be crawled, review and adjust the relevant robots.txt rules.
• Confirm that the updated rules do not unintentionally block other important areas of the site.

5. Incorrect Canonical URLs

A canonical tag identifies the preferred version of a page when multiple URLs have similar or duplicate content. Sitemap entries should generally match the canonical URLs you want search engines to index.

For example, a sitemap might list:

https://example.com/products/item-1/

But the page's canonical tag points to:

https://example.com/products/item-1/?variant=blue

This may indicate that the sitemap and the page's canonical signal do not match.

How to find the issue

• Crawl the URLs in the sitemap.
• Extract the canonical URL from each page.
• Compare the canonical URL against the sitemap URL.
• Identify pages whose canonical tags point to different URLs.

How to fix it

1. Determine which URL should be the preferred version.
2. Update the canonical tag to point to the intended canonical URL.
3. Update the sitemap to include the preferred URL.
4. Check internal links and redirects to ensure they support the same URL preference.

A page's canonical tag should not be treated as an automatic substitute for fixing inconsistent URL signals. Review the intended page structure before changing it.

6. Invalid XML Formatting

An XML sitemap must follow valid XML syntax and the sitemap protocol. Formatting errors can prevent search engines from parsing the file correctly.

Common formatting issues include:

• Missing closing tags.
• Incorrectly nested XML elements.
• Unescaped special characters.
• Invalid date formats.
• Missing or incorrect XML namespaces.
• Malformed URLs.

For example, an ampersand in a URL must be encoded as & in XML:

<loc>https://example.com/search?category=seo&amp;type=audit</loc>

How to find the issue

Use an XML validator or sitemap validation tool to check the file's syntax and structure. Also inspect the sitemap response to confirm that it is served as an XML document.

How to fix it

• Correct malformed tags and nesting.
• Escape special characters properly.
• Use valid URL formats.
• Ensure the XML namespace is correct.
• Regenerate the sitemap with a reliable sitemap generator if manual corrections are difficult.

A sitemap can be syntactically valid but still contain problematic URLs, so XML validation should be followed by a URL-level audit.

7. Sitemap Exceeds URL or File Size Limits

Sitemaps have limits on the number of URLs and the uncompressed file size. A single sitemap file can contain up to 50,000 URLs and must not exceed 50 MB when uncompressed.

Websites with larger URL inventories should use multiple sitemap files and a sitemap index.

How to find the issue

Check the number of URLs and the uncompressed size of each sitemap file. Review any sitemap processing errors reported in Google Search Console.

How to fix it

• Split large sitemap files into smaller sitemap files.
• Create a sitemap index that references each individual sitemap.
• Keep each file within the supported limits.
• Ensure that all referenced sitemap files are accessible and valid.

For example, a large ecommerce website might separate its sitemap into product, category, and blog sitemaps. This can also make it easier to monitor different types of pages.

8. Outdated or Stale Sitemap Entries

A sitemap may contain URLs that are no longer part of the website's active content. These entries can remain after content deletions, URL changes, or migrations.

Outdated lastmod values can also reduce the usefulness of the sitemap's update information. The value should represent the actual last significant modification of the page, not the date the sitemap was regenerated.

How to find the issue

• Compare sitemap URLs against the current website URL inventory.
• Check for URLs that no longer exist or have been replaced.
• Review lastmod dates for accuracy.
• Check whether newly published or updated pages are missing.

How to fix it

1. Remove URLs that are permanently deleted or no longer intended for indexing.
2. Add eligible new pages that are missing from the sitemap.
3. Update lastmod only when the page has genuinely changed in a meaningful way.
4. Automate sitemap generation when possible to reduce manual errors.

A sitemap should reflect the current state of the website, rather than serving as a historical list of every URL the site has ever published.

9. Sitemap URLs Returning 5xx Server Errors

A 5xx status code indicates a server-side problem. Common examples include 500 Internal Server Error, 502 Bad Gateway, 503 Service Unavailable, and 504 Gateway Timeout.

If sitemap URLs repeatedly return server errors, search engines may have difficulty accessing those pages. Temporary server problems can also cause inconsistent crawl results.

How to find the issue

• Crawl the URLs listed in the sitemap and check their HTTP status codes.
• Review server logs for recurring errors.
• Check whether the affected URLs return errors consistently or only during periods of high traffic.
• Monitor hosting performance and availability.

How to fix it

1. Identify the underlying server error and resolve the relevant application or hosting issue.
2. Check database connections, server resources, and application logs when appropriate.
3. Retry affected URLs after the server has recovered.
4. Recheck the sitemap to confirm that its important URLs return successful responses.

Do not remove important pages from the sitemap just because the server is temporarily unavailable. Investigate whether the error is temporary or indicates a persistent problem.

10. Missing or Incorrect Sitemap Index References

Websites with multiple sitemap files may use a sitemap index to organize and reference them. If the index contains broken or incorrect sitemap URLs, search engines may not be able to discover all the intended sitemap files.

For example, a sitemap index may reference:

<?xml version="1.0" encoding="UTF-8"?>
<sitemapindex xmlns="http://www.sitemaps.org/schemas/sitemap/0.9">
  <sitemap>
    <loc>https://example.com/sitemap-posts.xml</loc>
  </sitemap>
  <sitemap>
    <loc>https://example.com/sitemap-products.xml</loc>
  </sitemap>
</sitemapindex>

Each referenced sitemap should be accessible and contain valid XML.

How to find the issue

• Open the sitemap index and review its referenced sitemap URLs.
• Check that each referenced file returns a successful HTTP response.
• Validate each individual sitemap.
• Confirm that the sitemap index points to the current files rather than outdated locations.

How to fix it

• Correct any incorrect sitemap URLs in the index.
• Remove references to files that are no longer in use.
• Restore missing sitemap files if they are still required.
• Check that the index and its child sitemaps are accessible to search engines.

How to Find XML Sitemap Errors Using a Website Crawler

A website crawler can help identify technical issues affecting sitemap URLs. Rather than checking each entry manually, you can use a crawler to collect status codes, indexability information, canonical URLs, and other technical data.

1. Locate your sitemap
   Open your website's sitemap URL, commonly found at /sitemap.xml. If your website uses a sitemap index, identify the individual sitemap files it references.
2. Crawl the sitemap URLs
   Use a crawler that supports sitemap imports or sitemap-based crawling. This allows you to inspect the URLs submitted in the sitemap without relying exclusively on website navigation.
3. Review HTTP status codes
   Look for URLs returning 3xx redirects, 4xx client errors, or 5xx server errors. Check whether the URLs are intended to remain in the sitemap.
4. Check indexability and canonical signals
   Review pages for noindex directives, robots.txt restrictions, and canonical mismatches. Compare the results with your intended indexable URL inventory.
5. Fix issues and crawl again
   After correcting the errors, run another crawl to confirm that the affected URLs now return the expected status codes and have consistent indexing signals.

How to Check Sitemap Errors in Google Search Console

Google Search Console provides sitemap reporting that helps website owners monitor submitted sitemaps and identify processing problems.

1. Open Google Search Console
   Select the website property you want to inspect.
2. Navigate to the Sitemaps report
   Find the Sitemaps section in the left-hand navigation menu.
3. Review submitted sitemap files
   Check the sitemap URLs, submission dates, last read dates, and reported status. Review any errors or warnings displayed for individual sitemaps.
4. Inspect reported problems
   Investigate errors related to sitemap retrieval, parsing, or invalid URLs. Some processing issues require correcting the sitemap file itself, while others may involve server or access problems.
5. Resubmit the corrected sitemap
   After making the necessary changes, submit the updated sitemap if appropriate and monitor its processing status.

XML Sitemap Audit Checklist

Use this checklist when reviewing a sitemap after a website migration, a major content update, or a routine technical SEO audit.

How Often Should You Audit Your XML Sitemap?

The frequency of sitemap audits depends on how often your website changes and how your sitemap is generated.

Automated sitemap generation can reduce errors caused by manually maintaining URL lists. However, automated generation should still be checked to ensure it excludes URLs that are not intended for indexing.