To replicate: 1. Go to item search. 2. Enter parameters that retrieve more than 500 items. 3. From the item search results page, show All entries, then "Select visible rows." 4. Select either Export selected results to CSV or Barcode file. 5. A resulting error message of either "This site can't be reached. The connection was reset" or a 400 Bad request page with a URL with all the item numbers inserted appears.