Question: What does the link error “The Underlying Connection was Closed” mean?
Answer: This message appears in the ‘Link Errors’ section of InSite and is the result of a failed communication with a remote webserver.
To get more details make the ‘Error’ column wider so you can any additional information. This message usually contains more text than is initially visible. It can be caused by an invalid hostname or some other problem with the server (like the site is down).
Also try loading this page in your browser (right click the error and select ‘Open Page in Browser’). This will load the erroneous link and will hopefully provide some more clues.