how to locate 404 links

Maybe You should install XML-Sitemap? Only You must rebuild sitemap, go to Google Webmaster Tools, and give address of your sitemap.

I have XML-sitemap.

Still gives me some 404… dont know what I am doing wrong.

Google Tools should provide this information under Diagnostics > Crawl Errors. Click the number under “Linked From”.

I have noticed similar problem with my sites. Google webmaster tools reported 404 links to: https://www.domain.com/a/ from all pages. But there is no link https://www.domain.com/a/ in source of any page.

Don’t know where did that came from?!

I have the same issue – not really sure what is going on here: I have XML-sitemaps installed but I don’t know where google is finding this link as it doesn’t exist on any of my pages (apparently every page in google is pointing at this mysterious address and I’m positive it’s not!)

btw, I’m talking about the reported missing page: ‘www.mydomain.com/a’

apparently this is a jquery issue and according to the google forums it shouldn’t affect your site’s crawling, indexing or ranking. You can block the page using robots.txt or use a 301 redirect in .htaccess to prevent the error from appearing in webmaster tools.