Robozilla is a webcrawler that periodically scans the directory for broken and outdated links. Robozilla notes when a page has moved or is not found. Editors can then correct the errors found. Robozilla error codes are positive numbers greater than 100 or negative numbers.
The positive numbers represent errors in HTTP protocol: Robozilla was able to talk to the server, but couldn't get to the document. The negative numbers mean that Robozilla was unable to talk to the server.
To fix an error, the best first step is to click on the link to make sure it is really dead.
- Often a link may have been down for a short period and is now active again.
- Sometimes a user will be redirected to a new website and the appropriate course is to change the URL on the record to reflect the new address.
- Sometimes the URL may be typed incorrectly.
- If the base server URL itself is responding, it's probably a temporary problem.
- If the user root doesn't respond, the site may be permanently gone and deleting the link may be appropriate.
- Before deleting a bad link, it's worth doing a quick search to see if the content exists under a new URL.
While determining whether the site is still active, leave the link in the list of unreviewed sites.
For further details, you may wish to refer to the document entitled What should I do about Robozilla Errors?