iphone, 3.4.9: no UPnP/DLNA servers visible when device acts as access point

[nbpf]

When my iPhone acts as an access point for my UPnP/DLNA servers (hotspot on), these servers are not visible under "Network > File Servers". In the same setting, these servers are visible with mconnect, 8player, Linn Kazoo, etc. Any idea how to fix this issue? Thanks, nbpf