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Check Your Links
Dead Links
Dead links inevitably occur on Web servers as pages are modified, moved or deleted over time. However, dead links can quickly damage a Web site's credibility. The data managers for a given site are responsible for monitoring and maintaining their collections. They should periodically check for dead links and correct or remove them as soon as they are discovered.
To aid the data managers, NCC runs a monthly program which generates a "404
error report" for each Time Sharing System Management System (TSSMS) account. This report lists the "Files not Found" and the referring URL. (These reports can be found at http://www.epa.gov/reports/objects/YourTssms/404_error_reports/ for public access or http://intranet.epa.gov/reports/objects/YourTssms/404_error_reports/ for intranet. For example: http://www.epa.gov/reports/objects/epapages/404_error_reports/) There are also many other automated dead link detectors available to the data manager such as those listed on Yahoo 
When changing URLs on your document collections, coordination may be required with external servers which point to those URLs. (This is why it's essential to include the alias "www.epa.gov" in all URLs distributed for linking.) When moving a home page to a new URL, courteous data owners often provide a "jumper" page, providing information about the site's new URL.
