Created attachment 3944 [details]
the capture of strace
when using System.Net.Sockets.Socket to create a async socket, run strace on the server,perhaps it was run in poll, not epoll, my application run on centos 6.3, mono version is 3.0.7, for detail you can get the attachment.
Thank you for your report!
It appears you are running a very old version of Mono. Could you please try to update to any recent version and try to reproduce the issue again.
If the issue still persists please include the version information and change the bug status to NEW.