RE: Radius crashing with "Failed adding event handler for socket: Too many readers"

That will help, but won't fix the underlying issue. The better fix for you is to reduce the number of "src_ipaddr" in your configuration. May guess is you have 4-5. When you add various other sockets that the server uses, you reach the limit of 256 sockets pretty quickly.

We had src_ipaddr specified for all 150+ home_servers - hence why this issue was appearing. Unfortunately due to the dummy interface (anycast) (any0) we had the specify the source ip for various reasons. Ultimately I removed all the src_ipaddr directives and added an iptables SNAT rule to modify all the outbound packets for dest ports 1812/1813. So far it seems to be working, hopefully it doesn't run out of sockets this way.... Thanks for your help Alan. --Campbell