Hello,
I'm getting login failures for user "admin" around every minute from a ip address which belongs to the router itself.
Winbox service is restricted to our internal subnets.

Any idead what causing this?

dude?

OMG, thank you, exactly.

OMG, thank you, exactly.

I got the same issues, a lot of login failure for user admin from IP xxxx.yyyy.zzzz.wwww via winbox, since admin account was disabled,
i reenabled it but the error is the same, dude is enabled but login with another user account, does Dude needed to be login with admin?

May i know how you solve the annoying problem, please?

I solved this problem by disable dude and no more login failure for user admin from xxx.xxx.xxx.xxx via winbox.