What is a Crawl Error?
7 min read
A Crawl Error is a technical issue encountered by a search engine spider (such as Googlebot) when attempting to reach, fetch, or render a URL on your domain. Divided into Site Errors (infrastructure failures affecting your entire domain, such as DNS resolution drops or server crashes) and URL Errors (page-level failures such as 404 Not Found, 500 Internal Server Errors, or blocked directives), crawl errors prevent search bots from discovering content and indexing commercial landing pages.
Site Errors vs. URL Errors Compared
Search engines classify crawl issues based on whether they stem from domain-wide infrastructure or individual page configurations:
| Error Classification | Underlying Cause | Example HTTP Response | Algorithmic Consequence |
|---|---|---|---|
| Site Errors | Domain DNS lookup failure, origin hosting crash, or firewall blocking bot IP ranges. | DNS Timeout, 503 Service Unavailable, 403 Forbidden on root. | Severe: Googlebot stops crawling the entire domain to avoid crashing the server. |
| URL Errors | Specific webpage deleted, script error in template, or broken internal link. | 404 Not Found, 410 Gone, 500 Internal Server Error. | Localized: The specific URL drops from the index, but the rest of the site is unaffected. |
The Top 4 Crawl Error Types & Technical Root Causes
Inspecting error logs in Google Search Console reveals standard operational issues:
Common Crawl Failures in Software Deployments
- Server 5xx Errors: Caused by database connection limits, memory exhaustion during background tasks, or gateway timeouts behind load balancers.
- Soft 404 Errors: The server returns an HTTP 200 OK header, but the page content displays an empty state or "resource not found" message.
- Blocked by Robots.txt: Disallow rules preventing crawlers from accessing URLs that are simultaneously submitted in XML sitemaps.
- Access Denied (403): Web Application Firewalls (Cloudflare, AWS WAF) misidentifying legitimate Googlebot crawlers as malicious scraper traffic.
Playbook: Diagnosing and Resolving Crawl Errors in Search Console
Review GSC Page Indexing Report → Verify Live URL via URL Inspection → Apply 301 Redirect or Fix Server 500 → Validate Fix in GSC
Never leave broken internal links pointing to 404 URLs. Update internal links in page templates to point directly to working destinations, and serve explicit 410 Gone status codes for permanently retired features.
Frequently Asked Questions
Do 404 crawl errors hurt our entire website ranking authority?
No. Standard 404 errors on naturally deleted pages do not harm other pages on your site. Google treats 404s as a normal part of the web. However, if internal navigation or high-authority backlinks point to a 404, you lose internal equity.
How quickly does Googlebot re-crawl a page after a crawl error is fixed?
For frequently crawled pages, re-crawling usually occurs within 48 to 72 hours. For deeper pages, it may take 1 to 3 weeks unless you manually request re-indexing via the Search Console URL Inspection tool.
What is a soft 404 error and how do you fix it?
A soft 404 happens when a page looks like an error to search engines (thin content, missing item message) but returns an HTTP 200 OK status code. Fix it by returning an authentic 404 or 410 HTTP header, or adding substantive content to satisfy user intent.