Each TCP connection requires a unique combination of (server port, client port). Your server port is fixed: 80 or 443. They need to use a new ephemeral port for

Each TCP connection requires a unique combination of (server port, client port). Your server port is fixed: 80 or 443. They need to use a new ephemeral port for each connection. You will have 7000 sockets (file descriptors), but that's much more manageable than 7000 ports.