Dead chains, which are bad chains, invalid links, broken links, Dead links. If too many dead chain in the website, it is the influence SEO. Then you need to use some dead chain detection tool to check out where the dead chain is and then fix it.
1. Xenu
Xune is a free desktop software that detects all links to your entire site, and tell you what is good, what is dead, what is timed out and what is temporarily unreachable, and then generate a detailed report for you, but I've never read those reports-because there are too many links.
2.Dead Links (www.dead-links.com)
Dead Links is a Web site that provides free link detection services, and you can check all the links in your blog, and the results are divided into three types: internal, external, and unauthenticated. The overall effect was almost Xenu.
3.linktiger.com
Linktiger, the name is very good, the main service for the weekly or daily link to the fate of your blog to send to your mailbox, but the free account can only detect 1000 links, too stingy.
4.linkpatch.com
This is what I found yesterday, very funny. After you sign up for a piece of code to copy and paste into your 404 template (404.php), and then your blog once the 404 page, Linkpatch will send this message to you by e-mail, is the error report it.
5.Broken Link Checker (http://wordpress.org/extend/plugins/broken-link-checker/)
Broken link Checker is a WordPress plugin, but also my current favorite dead link detection software. Its advantage is not only can detect all the article dead link and reset link, but also can directly in WordPress backstage to these links to modify. However, there is a shortage of places, it is only in your WordPress backstage only when the test, the big lazy one.
Attention:
1. Before using the dead link checking tool, you have to be sure you are patient enough. For example, I use broken link checker Check out the site there are more than 3,000 invalid links, I chose to give up to take care of them. It is expected that the plugin author may be able to add bulk functionality in future releases.
2. Invalid link checking tool Check out the bad chain is not necessarily the real bad, sometimes may only temporarily inaccessible or inaccessible in some countries, will also be judged as dead chain. So, detect dead chain, Judge dead chain, finally delete or repair dead chain. This is really a boring thing.