vlc : discover UPnP service problem

Hello,

with 2 machines on my local network (the 2 with vlc 1.1.10, debian package) :

• the first is an UPnP server (mediatomb)
• the second is only a gnu/linux client

I can browse mediatomb server on the second machine with vlc.

I CANNOT browse it on the first machine with vlc.

I double checked that both vlc had upnp (discover service) option enabled in configuration.

I don't know how to fix that problem. I don't know where to start ...

Thank you in advance.