Upon completing your site audit, you may notice the error 4XX Page, meaning pages of your site are returning a 4XX HTTP status code.
By clicking on this error/issue, you will be shown the URLs/pages that are affected by this issue; you may come across some URLs that are 403 Forbidden.
This means that your site is most probably returning different content for our user-agent. In this case, you should check that you do not have a system/plugin blocking bots; and if you do, to whitelist our user-agent on that system.
User-agent: AhrefsSiteAudit
This issue should not affect visitors, but it does mean that some crawlers may not be able to crawl your website; hence, we are unable to report any errors on these pages.