This means that the URL in question is an external URL that redirected to a URL that was not accessible when Sitebulb crawled the website.
A redirected URL, typically 301 (permanent) or 302 (temporary) means that the location of the page has changed, and the user is sent from the original URL to a new one. In this case, the user is sent to a page that is not accessible.
This is a bad experience for users and search engines alike, as they will be unable to reach the content.
In the case of the destination URL being 5XX, it might be that nothing is actually wrong, and the server happened to be unresponsive at the time the request was made. However, typically the case is that redirects point at 404 pages, which certainly do need to be resolved.
This Hint will trigger for any external URL which redirects, where the redirect URL returns a HTTP status code of 4XX or 5XX.
The Hint would trigger for any URL if it returned a 4XX HTTP header response, for example;
HTTP/... 404 Not Found
...
Or a 5XX HTTP header response, for example:
HTTP/... 500 Internal Server Error
...
If a URL is redirecting to a resource that no longer exists, then this needs to be handled in one of two ways:
In both the resolution options above, the final stage of the job requires you to find all the links which point at the redirecting URL, and update these.
You can find these by clicking on the blue URL Details button from the URL List, then navigating to Incoming Links.
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