Common causes of Page Not Found errors are
- site redesigns in which many paths and URLS are no longer used
- changing paths when reorganizing or re-branding content
- deleting pages
To track these in Google Analytics,
- From the top menu select Reporting.
- In the sidebar menu of the Reporting page select Behavior and beneath that Site Content -> All Pages
- Towards the center of the page, just above the results table, find Primary Dimensions and click Page Title to show titles instead of paths in the table beneath it.
- The table defaults to ten entries. If no Page Not Found entries are found in the first ten results, you can expand the number of table rows in the Show rows drop-down at the bottom right hand corner of the table.
- You can also search Page Not Found in the search box found at the top right of the table.
- You should now see the paths of all the pages causing the error.
- Click on one of the listed paths.
- One way to find external links to these pages is to add Secondary Dimension “Full Referrer“
- Now a second column will be added, showing external pages where the visitors came from. Send emails to the webmasters of the listed sites to request updates as needed. It’s helpful to provide the correct URL when making the requests.
- To find internal links, change the secondary dimension from Full Referrer to “Previous Page Path”
- The second column will now show the internal page(s) with the broken link.