Here I found this: https://community.cisco.com/t5/unified-communications/axl-http-599-error/m-p/2294204/highlight/true#M42815. Are you sure your database is version 11.5?
Here I found this: https://community.cisco.com/t5/unified-communications/axl-http-599-error/m-p/2294204/highlight/true#M42815. Are you sure your database is version 11.5?