Telnet connection closes immediately when running Zephyr-adapted Advanced Chat Server example

[leonardocavagnis]

Using the Ethernet/Advanced Chat Server example adapted for Zephyr (see attachment), the Telnet connection closes right after the greeting message.

Serial output shows:

Chat server address: 192.168.2.9
We have a new client #0

Client side:

Connected to 192.168.2.9.
Hello, client number: 0
Connection closed by foreign host.

The connection drops immediately, before any data can be exchanged.