*) Major change - The Dude now uses winbox port, this includes agents. The port should change automatically both in client loader and agent configuration. But now that mean of an inscription in the window "Settings" of the "Server" tab? It is written there: the ports 2210 and 22...

First, check that the channel is functional using static IP addresses. Then you can start to fix the DHCP service.
Verify that the DHCP server binding to an bridge interface, rather than an ordinary LAN.