Too Many Open Files Error When Using Non-Blocking IO Muxer

(Doc ID 1544820.1)

Last updated on NOVEMBER 05, 2016

Applies to:

Oracle Weblogic Server - Version 10.3.6 to 10.3.6
Information in this document applies to any platform.


A "too many open files" error occurs when using a Non-Blocking IO Muxer. In the server logs, the following error message is noted


As per the documentation at, WebLogic Server provides a non-blocking IO implementation that may provide enhanced performance for some applications. If the Muxer Class attribute is set to weblogic.socket.NIOSocketMuxer or the -Dweblogic.MuxerClass=weblogic.socket.NIOSocketMuxer flag is set, this non-blocking IO is being used.


Sign In with your My Oracle Support account

Don't have a My Oracle Support account? Click to get started

My Oracle Support provides customers with access to over a
Million Knowledge Articles and hundreds of Community platforms