Unable to access a NFS share

Hello,

I've installed Proxmox on a fresh Wheezy. I can create a NFS share ( another fresh Wheezy server ) but Proxmox can not access it, error 500.

I can mount the share directly in Wheezy so I believe that the NFS server has any issue. I temprary solve the problem by creating the share on that mount but I would understand why Proxmox can not acces it.

In log files I see:
Sep 12 23:43:00 proxmox-1-00 rpc.statd[3177]: Version 1.2.6 starting
Sep 12 23:43:00 proxmox-1-00 rpc.statd[3177]: Flags: TI-RPC
Sep 12 23:43:00 proxmox-1-00 rpc.statd[3177]: failed to create RPC listeners, exiting
Sep 12 23:43:00 proxmox-1-00 pvedaemon[2707]: WARNING: mount error: mount.nfs: an incorrect mount option was specified

Thank for your help.

Michel