Router OS 5.0beta3 : i couldn’t connect winbox through IP. This problem has never happenned with beta2.
I was able to connect through MAC address.
After reboot, i can connect again to Winbox through IP address.
check you firewall or route, winbox to IP on v 5.3 works fine like all other version, tested on windows and linux
There is definitely a bug in winbox service in 5.0beta3!
After a day or two I can no longer connect with winbox. I have to ssh into the router, /ip service 6 disable and /ip service 6 enable and then I can connect with winbox again.
try beta4