ClientAbortException java.net.SocketException broken pipe
Platform Notice: Server and Data Center Only - This article only applies to Atlassian products on the server and data center platforms.
The following error appears in the logs:
WARNING: Exception Processing ErrorPage[errorCode=500, location=/500page.jsp] ClientAbortException: java.net.SocketException: Broken pipe WARNING: Exception Processing ErrorPage[errorCode=404, location=/fourohfour.action] ClientAbortException: java.net.SocketException: Broken pipe
The warning log basically means that the connection to the client browser is aborted before the response is fully transferred. It is a harmless warning as it can be due to transient network problems or the browser aborts/refreshes the page before it loaded.
This error is also known to affect image files in TIF format. Specifically, this error is thrown when browsing the page using Internet Explorer.
See also "Communications link failure" Error with JIRA User Management on MySQL. If the problem is not the database connection as described in that article, you may choose to do nothing. If you're getting a lot of these, it might be a sign of a performance problem.