Networking crash inside proxmox

Hi there,

I'm running a proxmox 2.1 cluster (2 nodes) since a while. Yesterday, while I had to shutdown a VM (KVM) and unfortunately, I clicked on the wrong button and I halted one on the node (...).
I restarted it, no error, but since the dramatic episode, I have big issues with networking:

• I can ping the two nodes
• I can browse the web pannel
• ...but I can"t ping any vm, although they're up and running (I can log into them via the console)
• VM can't ping themselves

Have you any idea ?

Thank you