Link rot can result from external as well as internal file changes or movements.
Linkbot Pro 4.0 from Tetranet Software Inc. of Ottawa troubleshoots link rot by crawling through a site and reporting conditions down to the desired level of detail. Linkbot Pro examines both simple and complex links, including those in JavaScript and Hypertext Markup Language 4.0 code. To fix problems shown in Linkbot's report, a user clicks the bad URL and edits the source code in any HTML editor. Site managers can turn to the Web itself.