Checked syncdhcp script found no issues. But non of the system is connecting to NMLN auth not reaching radius. At last found DWL-3200 has an issue which resolved after reboot. Conclusion:

1. WPA auth needs radius server which should be reachable and working before a client(AP) tried to access it.
2. Power shutdown on sunday switched off everything. After the power resumed all APs gone up but the server UPS was down (as result all servers were down). The Radius was unavailable and APs continue rejecting any WPA request without rechecking availability of radius again. On rebooting now it (APs) was able to get radius and started working.
3. For any future problem the sequence of “Radius UP before Clients” need to be ensured.