NiFi 1.23.2 'Too Many Open Files' After Enabling TLS – Closed TCP Connections Persist

I'm using NiFi 1.23.2 in our production environment. It works fine when TLS is disabled, but after enabling TLS, we encounter a 'too many open files' issue. Through further investigation using lsof combined with the ss command, we discovered a large number of closed TCP connections with socket transmission buffers showing as 0t0. Why does this situation occur? Is this a bug in NiFi itself?