An error message is observed in the log files when smbd is started: “open_oplock_ipc: Failed to get local UDP socket for address 100007f. Error was Cannot assign requested.”

Your loopback device isn't working correctly. Make sure it is configured correctly. The loopback device is an internal (virtual) network device with the IP address 127.0.0.1 . Read your OS documentation for details on how to configure the loopback on your system.