Kazoo does not find MinimServer of QNAP

[simoncn]

It is surprising that MinimWatch can find MinimServer but Linn Kazoo (running on the same PC) cannot.

If MinimServer is still doing its initial scan (this could take a long time with a large library), it will not be visible to UPnP control points until the scan has finished.

If this is not the reason, another possibility is a network issue related to UPnP multicast discovery or IGMP snooping. Powering all your network equipment off and on might resolve this. You could start by just powering the TVS-463 off and on to see if that changes anything.