Win10 to Win10 on local LAN always immediately finishes despite duration

[kc8viq]

Running "ethr -c 172.16.2.99" for example, to connect between Win10 PCs on local LAN always yields "Ethr done, connection terminated" as soon as I run it. Works perfectly fine when connected to between server/client on the same PC (-s and -c on localhost). But using the network doesn't work. Windows Firewall is set to allow, the server process logs a connection for a split second. Client never really stays connected, even with -d set to a longer time (not that the default 10 seconds works either) Tested LAN and WLAN. Is there something I'm doing wrong?