ColdFusion Server 5: NS IO_ERROR Reported in Webserver Log
This article applies to customers who are experiencing "NS IO_ERROR" error messages in their web server log. This issue, which affects developers using ColdFusion Server 5 and Netscape iPlanet 4x web server, occurs when a user clicks Back or Refresh in their browser during a file upload or form post. This error is benign, but you can fix it, as explained in this TechNote.
ColdFusion Server 5: NS IO_ERROR Reported in Webserver Log