This question should be on the -users list, but... On Mon, 2017-10-23 at 23:44 +0530, Imdad Hasan wrote:

How can i Re-Open that particular session which is closed cause of not getting accounting data from Client(Router) ?

What does this mean? It's your NAS that has sessions, not FreeRADIUS. If you haven't received an Accounting Stop from the NAS, then it's still "open". Once the session is gone and the NAS has sent the Stop, the only way to get the session open again is for the user device to log in again. Anything else is meaningless. -- Matthew