FR 3.0.21 : Failed adding proxy socket: Too many open sockets

Hi, We are upgrading our eduroam proxy server to FR 3.0.21. We have ~550 clients and home_server. When we start FR, it seems that the number of udp socket keep increases, we have a lot of log lines like : Info:  ... adding new socket proxy address * port 50740 Until this one : Error: Failed adding proxy socket: Too many open sockets Then, some proxied requests are still working fine but other ones (new ones which need a new socket ?) are rejected : (365476) Tue Aug 18 15:05:46 2020: ERROR: proxy: Failed allocating Id for proxied request With netstat or lsof, udp sockets are opened but not so many : $ lsof -p <freeradius_pid> | grep UDP | wc -l 259 Any idea how to solve this issue ? Regards, Arnaud Lauriou