I download the newest code in github, master branch.After I fixed some small bugs, run the freeRadius server 4.0 by radiusd -X It show like this: ... ... Scheduler created in single-threaded mode #### Opening listener interfaces #### Ready to process requests Network - Failed adding new socket to network event loop: Failed inserting filters for FD 15: EFAULT: Bad address Network - Failed adding new socket to network event loop: Failed inserting filters for FD 16: EFAULT: Bad address Network - Failed adding new socket to network event loop: Failed inserting filters for FD 17: EFAULT: Bad address Network - Failed adding new socket to network event loop: Failed inserting filters for FD 18: EFAULT: Bad address I checked the config files, but cannot find the cause. Could Anyone help to tell me how to do, thank you very much.