The 65k limit is per client address and port. Each client can have 65,535 connections to a single port on your server from each and every 65,535 of their own po

The 65k limit is per client address and port. Each client can have 65,535 connections to a single port on your server from each and every 65,535 of their own ports. (65,536? I dunno what would actually happen if you tried to use port 0.)