When you're cleaning up a post or page, you may notice that occasionally there is a link that is flagged as broken but is actually working.
Generally, links that take too long to load are flagged as "broken" because it takes too long for our crawler to load. If they take too long for our crawler, that generally means they will not be handled well for SEO purposes either!
If the link is performing satisfactorily for your purposes, you can mark the link as "ignore" in order to remove this link from broken link counts.