denied winbox/dude connect from x.x.x.x

Hello,

Since I’ve configured Dude in the core router to monitor all the devices in the network, it appears in the core router logs the message “denied winbox/dude connect from x.x.x.x”, being x.x.x.x the public IP that is attached to the router (this is the reason that carries me to assume that there is not any external attack). That strange message appears in three different installations, changing in each one the IP address x.x.x.x, for its public IP. What is producing that message and how can I controll it?

Regards,

Vicente