I see UDP socket is bind to port 0 which means kernel will allocate the ephemeral port based on the available list. I am observing that the port is still in open state even though after request is served. It's listed in netstat -anp command after 2 days. There is no message served by that port for last 2 days. *netstat -anp* output udp 0 0 0.0.0.0:*26307 *0.0.0.0:* 19293/radiusd Below is *ss -anp* output udp UNCONN 0 0 *:26307 *:* users:(("radiusd",pid=19293,fd=26)) Can anyone help to answer when this socket bind to port 26307 get closed or always in open state ? Problem here if suppose want to connect to 100 different AAAs, then all socket will be in open state which may not correct. Thanks, Saurabha