Same problem with my all wAP(RBwAP2ND) devices. Before all worked fine(v.6.36)... just upgraded to v.6.39.1
Quick solution for me was just turning off capsman...

Thanks! Added this rules. Hope this helps 

Hmm...



Now Just turned off SSH&Telnet services
P.S.
Is this going from my ISP internet to my AP, or from the hacker's computer directly to my AP?

Yes you are right. I realised that this is ISP cisco router mac

Hi. At the beginning I realised that someone is brute forcing my SSH and Telnet password. Then I do this >>> http://wiki.mikrotik.com/wiki/Bruteforce_login_prevention After that http://www.rck.lv/video/ssh%20bruta.jpg But when I blocking this MAC, starts this http://www.rck.lv/video/block%20mac.jpg ...

Hi. Problem with internet speed. RB433AH ----->hEX PoE lite ----PoE---> RBwAP2nD r2 http://www.rck.lv/video/mikrotik1.png RB433AH http://www.rck.lv/video/mikrotik4.jpg wAP http://www.rck.lv/video/mikrotik5.jpg Two other RBwAP2nD r2 I connected to this Routerboard as a standard AP with default config...

http://wiki.mikrotik.com/wiki/Supported_Hardware

Seems Supported. But why router dont recognize it?

Hello.

I have installed mpci MP-541D (Intel 82541 PI) card on my router RB433AH v.6.28.
Is this type of Ethernet card supported?