WD Mybook Live

Hi,

it depends maybe on Router settings. Routeros 3.25 what i have on a RB450G.
I can Connect as a network drive, but cannot start setup, coz its web based and ie, and chrome says :

101net::ERR_CONNECTION_RESET

uPNP uses ports utp 2869 and udp 1900. winfirewall lets them in.

Propertys of mybooklive tells me that it has a ip adress 192.168.88.252:49152.

Is it possible that i have to enable something on the router to let windows browse the setup page on the hdd?
i use absolute the original settings on the router.

thanks in advance
Joker