Minimserver on QNAP TS-109 not visible on network

[Mordac]

I have installed minimserver 0.72 on a QNAP TS-109 NAS, following the instructions to first install JRE, then the server. After enabling the package and successfully installing minimwatch on a PC, I still can't see the server. Minimwatch stays grey, minimserver is not visible on Kinsky. The QNAP log shows that the server is enabled.

I think my LAN is OK, because mimserver is visible when installed on a Win7 PC.

Any clue ?