Closing a socket of a running process while keeping the process alive

Issue

• Closing a socket of a running process while keeping the process alive
• Need syntax for ss -K|--kill command
• We are trying to reload the TCP connection without restarting the service which doesn't have a reload command, so we are looking for the alternate command to kill the TCP connections
• RHEL7 command ss -K throws error:

$ ss -K '( sport = :9001 )'
Netid  State  Recv-Q  Send-Q  Local Address:Port  Peer Address:Port
SOCK_DESTROY answers: Invalid argument